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CONJ-SUBORD
(表示两件事同时发生)当…的时候，在…时
If something happens while something else is happening, the two things are happening at the same time.
例句
They were grinning and watching while one man laughed and poured beer over the head of another...
当一个男人大笑着把啤酒倒在另一个人头上时，他们都在乐呵呵地看着。
I sat on the settee to unwrap the package while he stood by...
我坐在长椅上打开包裹时他就站在旁边。
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CONJ-SUBORD
(表示某一件事是在另一件事发生过程中的某一时间点发生的)当…的时候，在…时
If something happens while something else happens, the first thing happens at some point during the time that the second thing is happening.
例句
The two ministers have yet to meet, but may do so while in New York...
两位部长尚未会面，但可能会在纽约碰头。
Never apply water to a burn from an electric shock while the casualty is still in contact with the electric current.
当被电击者还连着电时，千万不要把水弄到电击伤口上。
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CONJ-SUBORD
却;但是;然而
You use while at the beginning of a clause to introduce information which contrasts with information in the main clause.
例句
Marianne was tempted to turn the large rooms into traditional French-style salons, while Howard was in favour of a typically English look...
玛丽安娜想把这些大房间弄成传统法式客厅的样子，但是霍华德喜欢典型的英式风格。
The first two services are free, while the third costs ￡35.00.
前两项服务免费，但是第三项服务要花35英镑。
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CONJ-SUBORD
虽然;尽管
You use while, before making a statement, in order to introduce information that partly conflicts with your statement.
例句
While the numbers of such developments are relatively small, the potential market is large...
尽管这种增长的数量相对较小，但是潜在的市场是巨大的。
While the modelling business is by no means easy to get into, the good model, male or female, will always be in demand...
尽管模特行业绝不是那么容易进入的，但是好的模特，不论男女，总是需要的。