envelope
gb/ˈɛnvəlˌoʊp/ us/ˈɛnvəlˌoʊp/
A2
英语
~ 8000
boríték, burok, védőburkolat, burkolat, réteg, szigetelőköpeny, védőborító, épületburok, burkológörbe, burkolófelület, amplitúdó-burkológörbe
名词
A2
1
boríték
A2
用法模式：
to put [something] in an envelope
She slipped the check into an envelope and sealed it.
Becsúsztatta a csekket egy borítékba, majd leragasztotta.
Please write your return address clearly on the back of the envelope.
Kérjük, jól olvashatóan írja rá a feladó címét a boríték hátoldalára.
A thick brown envelope arrived with all the travel documents inside.
He opened the envelope and unfolded the letter with shaking hands.
The invitation came in a small blue envelope tied with a ribbon.
学习者例句
I put the birthday card in an envelope.
Betettem a születésnapi üdvözlőlapot egy borítékba.
Please open the envelope and read the letter.
Kérlek, bontsd fel a borítékot, és olvasd el a levelet.
He wrote her name on the front of the envelope.
The envelope was empty when I opened it.
She put some photos in an envelope for me.
常见错误：
Learners sometimes confuse the noun "envelope" with the verb "envelop" (to cover or surround). Another mistake is using "envelope" to mean a whole package or parcel; for larger items, "package" or "parcel" is more natural.
含义
paper cover for a letter
搭配
sealed envelope
|plain envelope
|brown envelope
|address an envelope
|open the envelope
|put [something] in an envelope
近义词
mailing envelope (More specific; clearly refers to an envelope used for sending things by post.)
|
cover (More general; can protect many kinds of objects, not just letters.)
反义词
postcard (A card sent without a paper cover, so the writing is not inside an envelope.)
主题
daily life
|communication
|daily_life
释义
A flat paper cover that holds a letter or paper, usually for sending it by mail.
A flat, usually paper container that you put a letter, card, or document in, especially for mailing.
名词
B2
2
用法模式：
an envelope of [substance or quality]
The star is surrounded by an envelope of hot gas.
A csillagot forró gázburok veszi körül.
A thin envelope of ice covered the surface of the lake.
A tó felszínét vékony jégréteg borította.
The mountain village lay in an envelope of fog until mid-morning.
The seeds are protected by an envelope of tough fibers.
The negotiations took place under an envelope of secrecy.
学习者例句
The city was in an envelope of thick fog.
A várost sűrű ködburok vette körül.
The planet has an envelope of gas around it.
A bolygót gázburok veszi körül.
A soft envelope of fat protects the organ.
At night, an envelope of darkness covered the town.
The house was hidden in an envelope of trees.
常见错误：
Learners may think this meaning always refers to paper envelopes like for letters. In science and formal writing, "envelope" often means any outer layer around something, especially gas, air, or other material.
含义
outer layer around something
搭配
an envelope of mist
|an envelope of gas
|protective envelope
|outer envelope
|atmospheric envelope
近义词
covering (Very general; any thing that covers something else, not always suggesting it fully surrounds it.)
|
shell (Suggests a harder or more solid outer layer; often used for eggs, nuts, or buildings.)
|
layer (Focuses on being one of several levels, not necessarily completely enclosing something.)
反义词
interior (Refers to the inside part, the opposite of the outer surrounding layer.)
|
exposed surface (Suggests something with no protective covering or envelope.)
主题
science
|nature
|technology
|daily_life
|core_vocabulary
释义
A layer or cover around something, like air, gas, or another material, that surrounds and often protects it.
A surrounding layer or covering that encloses or protects something, sometimes used figuratively.
名词
C1
TECHNICAL
3
épületburok
C1
用法模式：
the building envelope of [a building]
Improving the building envelope can significantly reduce heating and cooling costs.
Az épületburok korszerűsítése jelentősen csökkentheti a fűtési és hűtési költségeket.
Moisture damage often starts where the building envelope is poorly sealed.
A nedvesség okozta károsodás gyakran ott kezdődik, ahol az épületburok nincs megfelelően tömítve.
The architect designed a highly insulated building envelope for the new school.
Sensors were installed in the building envelope to monitor heat loss.
A continuous air barrier is essential for an efficient building envelope.
学习者例句
A good building envelope saves energy.
Egy jó épületburok energiát takarít meg.
The walls and roof are part of the building envelope.
A falak és a tető az épületburok részei.
They fixed leaks in the building envelope to stop heat loss.
The new house has a very tight building envelope.
Engineers tested the building envelope for air leaks.
含义
outer shell of a building
搭配
building envelope
|tight building envelope
|leaky building envelope
|improve the building envelope
|high-performance building envelope
近义词
building shell (Common in construction; focuses on the structural outside, sometimes less on performance aspects like insulation.)
|
building enclosure (Very close technical term; often used in engineering and code language.)
反义词
building interior (Refers to the inside spaces, which are separated from the outside by the building envelope.)
主题
science
|technology
|construction
|housing
释义
The whole outside part of a building, like walls, roof, windows, and doors, that separates inside from outside.
In architecture and construction, the complete physical boundary between the interior and exterior of a building, including walls, roof, windows, doors, and insulation.
名词
C2
TECHNICAL
4
burkológörbe
C2
用法模式：
the envelope of [a family of curves/surfaces]
The locus of all tangency points defines the envelope of the family of curves.
Az összes érintési pont mértani helye adja meg a görbecsalád burkológörbéjét.
In this diagram, the red line represents the envelope of the moving set of lines.
Ezen az ábrán a piros vonal a mozgó egyenesek családjának burkológörbéjét mutatja.
The designer used the envelope of the paths to determine the safe operating area.
We can approximate the upper envelope of these functions numerically.
The envelope of these circles is a cardioid-shaped curve.
学习者例句
In this math problem, we draw the envelope of many lines.
Ebben a matematikai feladatban sok egyenes burkológörbéjét rajzoljuk meg.
The envelope is the curve that touches every curve in the family.
A burkológörbe az a görbe, amely a család minden görbéjét érinti.
This red curve is the envelope of the blue curves.
We find the envelope by using both equations together.
The envelope shows the outer limit of all the lines.
含义
tangent boundary curve or surface
搭配
envelope of curves
|envelope of lines
|upper envelope
|lower envelope
|envelope of the family
近义词
boundary curve (Rough description; not all boundaries are envelopes in the strict mathematical sense.)
反义词
interior region (Refers to the space inside, rather than the tangent boundary formed by the envelope.)
主题
math
|engineering
|science
|education
释义
In math, a special line or surface that just touches many other lines or surfaces and makes the edge around all of them.
In mathematics and related fields, a curve or surface that is tangent to each one of a family of curves or surfaces and forms their common boundary.
名词
B2
TECHNICAL
5
用法模式：
the envelope of [a sound/signal]
The synthesizer’s envelope controls the attack and decay of each note.
A szintetizátor burkológörbéje szabályozza az egyes hangok felfutását és lecsengését.
By adjusting the amplitude envelope, you can make the sound sharper or smoother.
Az amplitúdó-burkológörbe beállításával élesebbé vagy lágyabbá teheted a hangot.
The compressor reacts to the envelope of the input signal.
This plugin lets you draw a custom envelope for the filter cutoff.
The ADSR envelope defines how quickly the sound reaches full volume and how it fades away.
学习者例句
The envelope shows how the sound grows and fades.
A burkológörbe megmutatja, hogyan erősödik fel és halkul el a hang.
You can change the envelope to make the note short or long.
Megváltoztathatod a burkológörbét, hogy a hang rövid vagy hosszú legyen.
This tool lets you edit the envelope of the signal.
A fast attack in the envelope makes the sound hit quickly.
The music teacher drew the envelope of the note on the board.
含义
shape of a sound’s loudness
搭配
amplitude envelope
|ADSR envelope
|control the envelope
|envelope generator
|shape the envelope
近义词
contour (Describes the general shape or outline; in audio, often refers to a similar idea but is less strictly technical.)
反义词
steady tone (A sound whose loudness does not change over time, so it effectively has no varying envelope.)
主题
music
|technology
|science
释义
In music and electronics, the envelope is the way a sound or signal becomes louder and quieter over time, often shown as a smooth line.
In audio, acoustics, and signal processing, the smooth curve or pattern that shows how the strength or loudness of a sound or signal changes over time.
语法
词典原形
envelope
IPA
GB/ˈɛnvəlˌoʊp/
US/ˈɛnvəlˌoʊp/
音节与重音
en - vel - ope （3 个音节）
Stress on 1st syllable (en)
词形变化
Noun
- Base: envelope
- Plural: envelopes
词族
Forms
envelopes
noun
Core family
envelop
verb
Advanced or less common
envelopment
noun
相关表达
back-of-the-envelope
1/bˈæk əv ðə ˈɛnvəlˌoʊp/
fixed phrase
quick, rough calculation
Used to describe a calculation or plan that is done very quickly, with only simple numbers and little detail.
例句
- I did a back-of-the-envelope calculation and guessed the project would cost about $10,000.
- Even a back-of-the-envelope estimate shows we can’t afford it this year.
- Let’s start with a back-of-the-envelope plan and then check the details later.
push the envelope
1/pˈʊʃ ðə ˈɛnvəlˌoʊp/
idiom
go beyond normal limits
To try to do something in a new or extreme way that goes beyond what people usually do or accept.
例句
- The company is really pushing the envelope with its new electric car design.
- This director always tries to push the envelope in terms of what can be shown on screen.
- Scientists must push the envelope if they want to make major discoveries.