pi
gb/pˈaɪ/ us/pˈaɪ/
B2
英语
pí, magándetektív, magánnyomozó, vezető kutató
名词
B2
TECHNICAL
1
pí
B1
用法模式：
pi
To find the circumference, multiply the diameter by pi.
A kerület kiszámításához szorozd meg az átmérőt pível.
Engineers often use 3.14159 as an approximation of pi.
A mérnökök gyakran 3,14159-et használnak a pí közelítő értékeként.
The calculator key for π gives a more accurate value than 3.14.
学习者例句
Pi is about 3.14.
A pí értéke körülbelül 3,14.
We use pi to calculate circles.
A körrel kapcsolatos számításokhoz pít használunk.
常见错误：
Learners may confuse pi (π) with the word pie; in writing, pi is often shown with the symbol π.
含义
3.14159… constant in circles
搭配
the value of pi
|pi equals 3.14
|approximately pi
|calculate pi
|pi to three decimal places
|pi radians
|pi squared
|pi times [number]
|a digit of pi
|the symbol pi
主题
math
|education
|science
释义
Pi is the number 3.14… used in circle math.
The mathematical constant equal to the ratio of a circle’s circumference to its diameter, approximately 3.14159.
名词
B2
TECHNICAL
2
pí
B2
用法模式：
the letter pi
In this equation, pi is written as the symbol π.
Ebben az egyenletben a pít a π jelöli.
The textbook uses capital Pi (Π) for a different variable.
A tankönyv a nagy pí (Π) jelet egy másik változó jelölésére használja.
She wrote the Greek letter pi on the board.
学习者例句
This symbol is pi: π.
Ez a pí jele: π.
Pi is a Greek letter.
A pí egy görög betű.
常见错误：
Learners may pronounce it like the English word pie; that pronunciation is standard in English, but it is not related to the food.
含义
Greek letter π
搭配
the Greek letter pi
|lowercase pi
|capital pi
|the pi symbol
|written as pi
|pronounced pi
主题
language
|math
|science
|education
释义
Pi is a Greek letter written π.
The 16th letter of the Greek alphabet, written π (lowercase) or Π (uppercase), often used as a symbol in mathematics and science.
名词
B2
3
magánnyomozó
C1
用法模式：
a PI
They hired a PI to find their missing relative.
Felfogadtak egy magándetektívet, hogy megtalálja az eltűnt rokonukat.
The PI interviewed neighbors and checked public records.
A magándetektív kikérdezte a szomszédokat, és átnézte a nyilvános nyilvántartásokat.
As a PI, he spends a lot of time doing surveillance.
学习者例句
We hired a PI.
Felfogadtunk egy magándetektívet.
The PI found new information.
A magándetektív új információkat talált.
常见错误：
Often written as PI or P.I.; it is an abbreviation, not related to π.
含义
private investigator (PI)
搭配
hire a PI
|a private investigator
|a PI firm
|a PI agency
|work as a PI
|a PI report
|a PI followed [someone]
|a PI investigated [something]
近义词
detective (More general; can be police or private.)
|
private detective (Very close in meaning; common alternative phrasing.)
主题
crime
|work
|law
释义
A PI is a person you pay to investigate something.
A private investigator; someone hired to find information or investigate a person or situation, especially outside the police.
名词
C1
FORMAL
4
用法模式：
the PI (on [a project/grant/study])
Dr. Chen is the PI on the new vaccine study.
Dr. Chen az új vakcinavizsgálat vezető kutatója.
The PI submitted the final report to the funding agency.
A vezető kutató benyújtotta a zárójelentést a finanszírozó ügynökségnek.
Please contact the PI if you have questions about the protocol.
学习者例句
She is the PI for this study.
Ő ennek a kutatásnak a vezető kutatója.
The PI leads the research.
A vezető kutató irányítja a kutatást.
常见错误：
In research contexts, PI usually means principal investigator, not private investigator; the meaning depends on the situation.
含义
lead researcher on a project
搭配
the study PI
|the project PI
|grant PI
|named PI
|co-PI
|PI responsibilities
|PI approval
|meet with the PI
近义词
lead researcher (Clear and less formal; not always an official title.)
|
project lead (Broader; can include non-research leadership roles.)
主题
education
|science
|work
释义
A PI is the main researcher in charge of a study.
The main researcher responsible for leading a scientific study or research project, especially on a grant-funded project.
语法
词典原形
pi
IPA
GB/pˈaɪ/
US/pˈaɪ/
音节与重音
pi （1 个音节）
Stress on 1st syllable (pi)
词形变化
Noun
- Base: pi
- Plural: pis
词族
Forms
pis
noun
相关表达
pi day
1/pˈaɪ dˈeɪ/
fixed phrase
annual celebration of π
Pi Day is March 14, when people celebrate pi.
例句
- Our school held a math contest on Pi Day.
- On Pi Day, the class memorized digits of π.
- They celebrated Pi Day by baking a pie for the office.
学习者例句
- Pi Day is March 14.
- We celebrate Pi Day at school.
pi r squared
1/pˈaɪ ˈɑɹ skwˈɛɹd/
fixed phrase
technical
area of a circle formula
“Pi r squared” means π × r × r for a circle’s area.
例句
- To find the area, use pi r squared.
- He wrote “A = pi r squared” at the top of the worksheet.
- Once you know the radius, pi r squared gives the area quickly.
学习者例句
- The area is pi r squared.
- We use pi r squared for circles.