while从句可放于主句之前或之后,表示对比或转折,相当于but,但语气没有but 重。
my wife was silent while i was writing.
我读书的时候,我妻子默默不语。
while he's good at science, his sister is absolutely hopeless.
他擅长理科,而他妹妹却是不可救药。
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