while的用法
while的用法有连词用法、引导状语从句、其他用法。具体如下：
1、连词用法。
While作为并列连词，意思为“而，然而”，表前后意义上的对比或转折。如：
（1）He worked hard, yet he couldn't get enough to eat because his salary was too low.
他虽然努力地工作，但由于工资低，他一直吃不饱。
（2）Some people waste food while others haven't enough.
有些人浪费粮食，然而有些人却吃不饱。
2、while引导状语从句。
（1）表示某个动作正在进行的同时，另一动作也在进行之中，这时主从句都用进行时态，有对同类的两个动作进行对比的意味。如：
She drifted off to sleep while listening to soft music.
她一边听着轻音乐，一边慢慢地睡着了。
（2）表示某个动作正在进行时，又发生了另一动作（该动作用一般过去时）。如：
While I was reading,I fell asleep．
我读着读着就睡着了。
3、其他用法。
（1）只要（＝as long as）。
There will be life while there is water and air．
只要有空气和水，就会有生命。
（2）而；然而（表示对比）。
As a contrast, while teachers can always accurately grasp the students' needs and teach them accordingly.
而老师总是能准确地把握学生的需求，因材施教。
（3）虽然（＝although）；尽管（表示让步）。
While the while teacher demands high standards from her students, she makes concessions at appropriate times to take care of their emotions and needs.
虽然老师对学生要求严格，但她在适当的时候也会做出让步，以照顾到学生的情绪和需求。
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绛旓細while 涔熶袱绉嶈瘝鎬с傝繛璇嶏細鏈変笁绉鐢ㄦ硶 寮曞鏃堕棿鐘惰浠庡彞銆傚 They were grinning and watching while one man laughed and poured beer over the head of another. 褰撲竴涓敺瀛愬ぇ绗戠潃鎶婂暏閰掑掑湪鍙︿竴涓汉澶翠笂鐨勬椂鍊欐椂锛屼粬浠兘鍦ㄤ箰鍛靛懙鍦扮湅鐫銆傚紩瀵艰姝ョ姸璇粠鍙ャ傚 While the numbers ...
