时间段:一段时间.如2 days,1 month,3 years,an hour等
时间点:具体的某个时间.10 o'clock,on wednesday,last year,yesterday等
表示时间段的组合:
since+时间点.如:I have been a student since last year.
for+时间段.如:I have been in the house for 7 days.
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