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while可以作连词，也可以作名词。
1 .“While”作连词时，可以表示 “在……的时候，与……同时”。“while” 可以放在句首使用，也可以在句中使用，但后者的句子中不使用逗号。
While we were sleeping, it snowed!
It snowed while we were sleeping!
While he was cooking, a parcel arrived.
A parcel arrived while he was cooking.
2 .“While” 作连词时，可以表示 “（对比两件事物）但是；然而”。
One of the twins is shy, while the other is outgoing.
It took me an hour to solve this maths problem, while it took her only five minutes!
3. “While” 和 “whilst” 作连词时，可以表示 “虽然，尽管”，这是一个相对正式的用法，相当于 “although”，常置于句首。
While I know that sugar is bad for me, I can never say no to dessert!
While I understand that is your opinion, I'm afraid I do not agree.
4. “While” 作名词时，指 “一段时间；一会儿”。
It’s been a while since we talked.
Are you looking for Jessica? I saw her a short while ago.
5. 表达 “worth your while” 的意思是 “值得你下功夫去做，对你有帮助”。
Even though we only had a short while together, we hope this lesson was worth your while.
Check out this article about how to keep a healthy diet–I promise it will be worth your while.
