stay 为不及物动词,后面为介词短语作位置状语
in bed 呆在床上,卧床休息
The doctor told her to stay in bed.
大夫不让她起来.
The doctor ordered him to stay in bed for a couple of days.
大夫叫他卧床一两天.
How long do I have to stay in bed?
我得呆在床上多久?
You'd better stay in bed today instead of going to class.
今天你最好在家休息不要去上课了.
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