inthebed和inbed的区别

in the bed的意思是在床上，表示在床里面，即在被窝里。in bed的意思是卧床，表示躺在床上、卧病在床，短语中的bed不指具体的床，故前在不用冠词，in也不能改成on。

in the bed造句：

Particles swim around in the bed。颗粒在床层中到处游动。

There seems to be something moving in the bed。床里面好像有个什么在动。

Bubble size is a key factor in determining the conditions in the bed。气泡尺寸是决定床内情况的一个关键因素。

in bed造句：

Mary's in bed，Don't wake her。玛丽在床上睡觉，不要吵醒她。
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Jerry often lies in bed and watches TV。杰瑞经常躺在床上看电视。

He was lying in bed talking on the phone with his girlfriend。他躺在床上和女朋友打电话。