作业帮on the bed on bed in the bed in bed 的区别
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on the bed on bed in the bed in bed 的区别
on the bed on bed in the bed in bed 的区别
on the bed on bed in the bed in bed 的区别
on the bed：在床上,但不一定躺着 ,有特指
on bed :在床上,但无特指
in bed：在床上,特指卧病在床
in the bed：在床上,且躺在床上