periodic
gb/pˌɪɹiˈɑdɪk/ us/pˌɪɹiˈɑdɪk/
B2
英语
~ 8000
义项
0 个义项
adjective
B2
property
1
happening regularly over time
Happening again and again with a regular time gap in between.
用法模式：
periodic [check/review/payment/event]
常见错误：
Learners sometimes confuse "periodic" with "regular" meaning "ordinary" or "normal" (e.g. *a periodic customer*). "Periodic" should describe things that happen again and again over time, such as checks, payments, or meetings. Learners also mix up "periodic" (adjective) with "periodical" (noun) for magazines or journals.
近义词
regular (Very common word; can also mean 'normal' or 'usual', not only 'at set intervals'.)
|
recurring (Focuses on something happening again; does not always suggest a strict schedule.)
反义词
continuous (Describes something that does not stop or break, instead of happening with gaps in between.)
搭配
periodic review
|periodic checks
|periodic payments
|periodic reports
|periodic inspections
|periodic maintenance
主题
time
|work
|daily life
|core_vocabulary
例句
- The company carries out periodic safety inspections of all its factories.
- You should schedule periodic checkups with your doctor, even if you feel healthy.
- The contract requires periodic payments every three months.
- The committee will provide periodic reports on the progress of the project.
- Periodic maintenance of the air-conditioning system prevents expensive breakdowns.
学习者例句
- I go for periodic health checks every year.
- The school sends periodic emails to parents.
- We have periodic meetings to talk about our work.
- The car needs periodic service to stay in good condition.
adjective
technical
C1
property
2
showing a repeating scientific pattern
In math and science, describing something whose behavior repeats in the same way after a set time or distance.
用法模式：
periodic [function/signal/motion/structure]
常见错误：
Learners may think "periodic" here only means "from time to time". In technical contexts it usually means the pattern repeats in exactly the same way after a fixed interval, not just occasionally.
近义词
cyclic (Technical; emphasizes movement or change in cycles, often used in physics and engineering.)
|
regularly repeating (More descriptive phrase, less technical; stresses the exact repetition.)
反义词
random (Describes behavior with no predictable pattern, the opposite of a fixed repeating pattern.)
搭配
periodic function
|periodic motion
|periodic signal
|periodic wave
|periodic structure
|periodic table
主题
science
|mathematics
|physics
|chemistry
|time
例句
- A sine wave is a classic example of a periodic function.
- The pendulum shows nearly periodic motion under small oscillations.
- The researcher analyzed the periodic signal produced by the rotating machine.
- In chemistry, the properties of the elements change in a periodic way as atomic number increases.
- The crystal has a highly ordered, periodic structure at the atomic level.
学习者例句
- In math class we learned that a sine curve is periodic.
- The scientist studied the periodic movement of the star.
- The light from the tower is periodic and flashes every ten seconds.
- The graph shows a periodic pattern that repeats again and again.
adjective
literary
C2
property
3
describing a type of sentence structure
Talking about a long sentence where the most important part comes at the end, after many other parts.
用法模式：
periodic [sentence/style/prose]
近义词
suspended (Specialist; in rhetoric, can describe a sentence where the main clause is delayed.)
反义词
loose (In rhetoric, a loose sentence states the main idea first and then adds extra information.)
搭配
periodic sentence
|periodic style
|periodic prose
主题
language
|literature
|education
|communication
例句
- The author opens the chapter with a long periodic sentence that delays the main point until the final clause.
- Periodic sentences were common in classical oratory, where delaying the main verb created a sense of suspense.
- Her essay overuses periodic structures, making the argument feel heavy and overly formal.
学习者例句
- In this lesson we studied what a periodic sentence is.
- A periodic sentence keeps the main idea until the end.
- Some writers use periodic style to sound formal.
语法
词典原形
periodic
IPA
GB/pˌɪɹiˈɑdɪk/
US/pˌɪɹiˈɑdɪk/
音节与重音
peri - od - ic （3 个音节）
Stress on 3rd syllable (ic)
词形变化
Adjective
- Base: periodic
词族
Core family
period
noun A2
periodically
adverb B2
Related words
periodical
adjective C1
Advanced or less common
periodicity
noun
相关表达
periodic check
1/pˌɪɹiˈɑdɪk t͡ʃˈɛk/
fixed phrase
regular check-up or inspection
A check that happens again and again after a certain amount of time has passed.
例句
- Drivers must pass a periodic check of their eyesight.
- The system runs a periodic check for software updates.
periodic function
1/pˌɪɹiˈɑdɪk fˈʌŋkʃən/
fixed phrase
technical
math function that repeats regularly
In math, a function whose graph repeats the same shape again and again after a fixed distance on the x-axis.
例句
- The teacher used a circle to explain what a periodic function is.
- Cosine is another example of a periodic function.
periodic inspection
1/pˌɪɹiˈɑdɪk ɪnspˈɛkʃən/
fixed phrase
formal
regular formal inspection
A careful and official check that happens regularly.
例句
- The building is subject to periodic inspection by fire officials.
- Periodic inspections ensure that safety standards are met.
periodic maintenance
1/pˌɪɹiˈɑdɪk mˈeɪntənəns/
fixed phrase
regular planned upkeep
Work that you do again and again at set times to keep a machine or system in good condition.
例句
- Periodic maintenance of the heating system reduces the risk of breakdowns.
- The contract includes periodic maintenance for all installed equipment.
periodic motion
1/pˌɪɹiˈɑdɪk mˈoʊʃən/
fixed phrase
technical
repeating physical movement over time
In physics, movement that repeats itself in the same way after the same time again and again.
例句
- A swinging pendulum is an example of periodic motion.
- The study of periodic motion is important in understanding waves and vibrations.
periodic payment
1/pˌɪɹiˈɑdɪk pˈeɪmənt/
fixed phrase
formal
regular scheduled payment
Money that you pay again and again on a fixed schedule, like every month or every year.
例句
- The loan will be repaid through periodic payments over five years.
- Tenants must make periodic payments of rent on the first of each month.
periodic report
1/pˌɪɹiˈɑdɪk ɹɪpˈɔɹt/
fixed phrase
formal
regularly issued update report
A document that gives news or numbers and is written again and again at planned times.
例句
- The manager submits periodic reports on sales figures to headquarters.
- Periodic reports help investors track the company’s performance.
periodic review
1/pˌɪɹiˈɑdɪk ɹɪvjˈu/
fixed phrase
formal
regular check or evaluation
A check or evaluation that happens again and again at planned times.
例句
- Employees have a periodic review of their performance every six months.
- The policy is subject to periodic review by the board.
periodic table
1/pˌɪɹiˈɑdɪk tˈeɪbəl/
fixed phrase
technical
chart of the chemical elements
A chart that shows all known chemical elements, arranged by their atomic number and similar chemical behavior.
例句
- Students were asked to label the metals on the periodic table.
- Hydrogen appears in the top left corner of the periodic table.
periodic table of the elements
1/pˌɪɹiˈɑdɪk tˈeɪbəl əv ðə ˈɛləmənts/
fixed phrase
technical
full name of elements chart
The full name for the periodic table, the chart that shows all the chemical elements.
例句
- In chemistry class we reviewed the periodic table of the elements.
- The poster of the periodic table of the elements hung on the lab wall.