expectancy
gb/ɪkspˈɛktənsi/ us/ɪkspˈɛktənsi/
B2
英语
~ 8900
义项
0 个义项
名词
B2
quantity
1
statistical expected length of life
The average time that people or things like this are expected to live or last, usually shown as a number of years.
用法模式：
[type] expectancy of [someone/something]
常见错误：
Learners sometimes say *"life expectation"* instead of *"life expectancy"*. Use *"expectancy"* when talking about a statistical average length of life. Also, *"expectancy"* is rarely used without a modifier like *"life"* or *"healthy"* in this sense.
近义词
lifespan (Refers to the actual or total length of life of an individual or thing, while expectancy is a predicted statistical average for a group.)
反义词
mortality rate (Focuses on how often deaths occur in a group, rather than how long members of the group are expected to live.)
搭配
life expectancy
|average life expectancy
|life expectancy at birth
|healthy life expectancy
|life expectancy of [group]
|increase in life expectancy
主题
health
|science
|statistics
|society
例句
- Life expectancy has increased dramatically over the last hundred years.
- In many countries, female life expectancy is higher than male life expectancy.
- Doctors explained that his life expectancy would be shorter without treatment.
- The report compares the life expectancy at birth in different regions.
- Improved sanitation and vaccines helped raise global life expectancy.
学习者例句
- The life expectancy in that country is about 80 years.
- Women usually have a higher life expectancy than men.
- Better food and clean water can increase life expectancy.
- The chart shows the life expectancy of different groups of people.
名词
formal
C1
state
2
state of anticipation or expectation
A strong feeling of waiting for something to happen.
用法模式：
in [adjective] expectancy
常见错误：
Learners often try to use *expectancy* where *expectation* or *hope* is more natural, for example saying *"I have an expectancy"* instead of *"I have an expectation"* or *"I expect"*. Use *expectancy* mostly for a general mood or feeling in a situation, often with words like *"air"*, *"sense"*, *"feeling"*, *"in eager expectancy"*.
近义词
anticipation (More common in everyday speech; *expectancy* sounds slightly more formal or literary and often describes the overall mood in a place or group.)
反义词
surprise (Surprise is the opposite condition, where something happens without being expected or waited for.)
搭配
in eager expectancy
|in anxious expectancy
|air of expectancy
|sense of expectancy
|mood of expectancy
主题
emotions
|communication
|literature
|core_vocabulary
例句
- The crowd waited in tense expectancy as the winner was announced.
- There was a buzz of expectancy in the room before the band came on stage.
- She opened the letter with a feeling of nervous expectancy.
- A hush of expectancy fell over the audience as the lights dimmed.
- His eyes shone with eager expectancy when he saw the wrapped boxes.
学习者例句
- The children watched the door in eager expectancy.
- There was a feeling of expectancy before the show started.
- She waited in quiet expectancy for his answer.
- The room was silent, full of expectancy.
名词
technical
C2
quantity
3
expected value in statistics
In mathematics and statistics, the average value you expect from many repeated tests of something random.
用法模式：
the expectancy of [a random variable]
常见错误：
Learners may mix up the everyday idea of *expecting* something with the precise mathematical meaning of *expectancy*. In this sense, *expectancy* is a calculated number (an average) in probability or statistics, not just a hope or belief. Also, in technical English, *expected value* or *expectation* is more common than *expectancy*.
近义词
expectation (In technical mathematics, *expectation* or *expected value* is the standard term; *expectancy* is a less common variant in this context.)
反义词
actual value (The actual value is what really occurs in one trial, as opposed to the theoretical average you calculate as the expectancy.)
搭配
mathematical expectancy
|probability expectancy
|compute the expectancy
|expected value (expectancy)
|mean expectancy
主题
mathematics
|science
|statistics
|education
例句
- In this game, the expectancy of your winnings is actually negative.
- We calculated the expectancy of the random variable X to be 2.5.
- The insurance company uses loss expectancy to set its premiums.
- If the dice are fair, the expectancy of a single roll is 3.5.
- Risk analysts often compare loss expectancy with the cost of controls.
学习者例句
- The teacher showed us how to find the expectancy of a dice roll.
- In this lottery, the expectancy of profit is very low.
- They used the loss expectancy to plan for future risk.
- We worked out the expectancy of X using a formula.
语法
词典原形
expectancy
IPA
GB/ɪkspˈɛktənsi/
US/ɪkspˈɛktənsi/
音节与重音
ex - pect - ancy （3 个音节）
Stress on 2nd syllable (pect)
词形变化
Noun
- Base: expectancy
- Plural: expectancies, expectancy
词族
Forms
expectancies
noun
Core family
expect
verb A2
expectation
noun B1
Related words
expectant
adjective
expectantly
adverb
Negative and opposite forms
unexpected
adjective B1
unexpectedly
adverb B1
相关表达
an air of expectancy
1/ən ˈɛɹ əv ɪkspˈɛktənsi/
fixed phrase
formal
general feeling of waiting
A strong feeling in a room or group that something is about to happen.
例句
- There was an air of expectancy in the hall before the ceremony began.
- As the curtain rose, an air of expectancy spread through the audience.
average life expectancy
1/ˈævɚɪd͡ʒ lˈaɪf ɪkspˈɛktənsi/
fixed phrase
mean expected lifespan in years
The usual or typical number of years that people in a group are expected to live, found by adding and dividing (the average).
例句
- The average life expectancy in that region is just over 75 years.
- Charts comparing average life expectancy help show health differences between countries.
healthy life expectancy
1/hˈɛlθi lˈaɪf ɪkspˈɛktənsi/
fixed phrase
technical
years expected in good health
The average number of years people are expected to live in good health, without big health problems or disability.
例句
- In some countries, healthy life expectancy is much lower than total life expectancy.
- Public health policies aim to increase healthy life expectancy, not just how long people live.
life expectancy
1/lˈaɪf ɪkspˈɛktənsi/
fixed phrase
average years people are expected to live
The average number of years that people in a country or group are expected to live.
例句
- Japan has one of the highest life expectancy rates in the world.
- Better healthcare has helped increase life expectancy over the last century.
- The report shows that life expectancy is still rising in most regions.
life expectancy at birth
1/lˈaɪf ɪkspˈɛktənsi ˈæt bˈɚθ/
fixed phrase
technical
expected lifespan of a newborn
The number of years a baby is expected to live, if today’s death rates stay the same.
例句
- Life expectancy at birth has increased in almost every country since 1950.
- The study compares life expectancy at birth for men and women.