while + 从句（表示“当……的时候”）
强调两个动作同时进行，从句可用一般时或进行时，位置较灵活。
She read a book while I cooked dinner.
我做饭的时候，她在看书。
当……的时候；在……期间
虽然；尽管；只要；在......的同时；虽然；当...的时候
在......的同时
During the same time that.
虽然
Although.
只要
As long as.
I always drink coffee while I read the morning news.
我总是在看早间新闻的时候喝咖啡。
用法提示：此处 while 是连词，表示两个动作同时发生，意为“在……的同时”。
Tom listened to music while he was doing his homework.
汤姆一边做作业一边听音乐。
用法提示：while 引导时间状语从句，说明做作业期间同时听音乐。
The dog waited by the door while its owner was taking a shower.
狗在主人洗澡的时候守在门边。
用法提示：while 作连词，连接两个同时进行的动作或状态。
强调两个动作同时进行，从句可用一般时或进行时，位置较灵活。
She read a book while I cooked dinner.
我做饭的时候，她在看书。
多放在句首，用来对比两种相反的情况，语气比 although 稍弱。
While he is clever, he is rather lazy.
他虽然聪明，却相当懒惰。
从句主语与主句主语一致时，可省去主语和 be 动词，直接用 -ing 形式。
He listened to music while doing his homework.
他一边做作业，一边听音乐。
与 while 作‘只要’讲时最接近，口语和书面都常用；但 as long as 也可表‘在……期间’，需靠上下文判断。
与 as long as 几乎同义，但更书面、正式，口语中出现较少。
多用于正式书面语，强调‘以……为条件’；that 可省略。
是 provided that 的非正式变体，口语可用；正式写作中不如 provided that 常见。
grammar · medium
易错句子While my stay in Beijing, I made many friends.
正确表达During my stay in Beijing, I made many friends.
while 是连词，后面必须接完整的从句（主语＋谓语），不能像汉语“在我逗留期间”那样直接跟名词短语。my stay in Beijing 只是名词短语，所以要用介词 during（或改为 While I was staying in Beijing, ...）。
grammar · medium
易错句子While the phone rang, I was cooking dinner.
正确表达When the phone rang, I was cooking dinner.
while 引导的是持续性动作，表示“在……的过程中”；rang 是瞬间动作，不能与 while 搭配。汉语“当……的时候”可兼指瞬间与持续，英语须区分：瞬间动作用 when，持续动作用 while。
grammar · medium
易错句子While he is very rich, but he is not happy.
正确表达While he is very rich, he is not happy.
while 表示“虽然、尽管”时本身已是从属连词，一个主从复合句只能有一个连接词。汉语“虽然……但是……”成对出现，直译成英语就会多出 but；去掉 but 即可。
顺便；在你做那件事的时候
You're going to the kitchen. While you're at it, bring me a glass of water.
你去厨房的时候，顺便给我带杯水。
售完即止；在库存持续期间
The sale price is valid only while supplies last.
特价仅在售完前有效。
既然说到这个话题；趁我们谈到这里
While we're on the subject, have you seen the new movie?
既然说到这个话题，你看过那部新电影吗？
趁热打铁
The market is favorable right now, so we should strike while the iron is hot.
现在的市场很有利，我们应该趁热打铁。
虽然…属实；尽管确实
While it's true that the task is difficult, we can still finish it on time.
虽然这个任务确实很困难，但我们仍能按时完成。
while的核心用法与时间有关，表示两个动作发生在同一段时间内。
与while表示“在……的同时”的含义一致，强调动作同时发生。
while还可表示“只要”，涉及条件关系。
while也可引导对比或转折，表示“虽然”。
while作为连词常用来引导时间、让步或条件状语从句。
趁热打铁；抓紧时机
You should make hay while the sun shines and finish the report now.
你应该趁热打铁，现在就完成报告。
趁热打铁；抓住有利时机
Strike while the iron is hot and ask for a raise while the company is doing well.
趁热打铁，趁公司效益好时要求加薪。
猫不在，老鼠翻天；管事的人不在，下面的人就会偷懒
While the cat's away, the mice will play—the students were noisy as soon as the teacher left.
猫不在，老鼠翻天——老师一离开，学生们就吵翻了天。
只要活着，就有希望。
A widely quoted English proverb expressing optimism; it appears in literature, speeches, and films.
一句广为引用的英语谚语，表达乐观精神，常见于文学、演讲和电影中。
趁热打铁。
A traditional proverb meaning to act promptly while the opportunity exists.
一句传统谚语，意为趁机会还在时及时行动。
Choose the next layer that will help you use while with more confidence.
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.