when
英 [wen] 美 [wɛn]

adv.

什么时候；（用于时间的表达方式之后）在那时；其时；当时

conj.

在…时；既然；如果；

pron.

什么时候；那时；

n.

时间，时候；日期；场合；

双语释义

adv.(副词)

1. 什么时候 at what time
2. 在那时,其时 at or on which

conj.(连词)

1. 在…时,当时 at or during the time that
2. 如果,要是if
3. 既然,考虑到 since; considering that

英英释义

When

• "When"- a song by French singer Amanda Lear released in 1980 by Ariola Records.

以上来源于:Wikipedia

同近义词辨析

when, as, while

when从句动词点动词，持续性动词均可，

as重在表示动作同时发生，伴随进行，

while 从句动词为持续性动词 While I slept, a thief broke in.

双语例句

用作副词(adv.)

1. When did that happen?
   那件事是什么时候发生的？
2. They stood respectfully when he entered the room.
   当他走进房间时，他们都恭恭敬敬地站着。
3. Iron will melt when it is made very hot.
   当铁烧得很热时就会熔化的。

用作连词(conj.)

1. And they roared when Seaman held up two fingers.
   然后当希曼伸出两根指头的时候他们就吼叫起来。
2. I stayed till noon, when I went home.
   我留到中午，然后就回家了。
3. When all is said and done,we still must eat.
   可是说到底，我们还得吃饭。
4. But when I returned the door was open.
   可是回来时门是开着的。
5. How can they learn anything when they spend all their spare time watching television?
   他们把所有的空闲时间都用来看电视了，还能学什麽东西呢？
6. It was the sort of morning when everything goes wrong.
   那天上午就是那样，事事不顺心。
7. He entered on his inheritance when he was 21.
   他21岁时继承了财产。

权威例句

When Is “Nearest Neighbor” Meaningful?
When New Technologies Cause Great Firms to Fail
Leadership when there is no one to ask: Welcome to the experience economy
When Employees Feel Betrayed: A Model of How Psychological Contract Violation Develops
Estimating Survivorship when the Subjects are Visited Periodically
Time flies when you're having fun: cognitive absorption and beliefs about information technology usage 1
From inflammation to sickness and depression: when the immune system subjugates the brain.
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Foschini Jr., “Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas
The Wisconsin Epidemiologic Study of Diabetic Retinopathy: II. Prevalence and Risk of Diabetic Retinopathy When Age at Diagnosis Is ...