意思是床基础河底， 海底，例如：
1、He's in bed with a temperature of 40 ?.他卧病在床，高烧40摄氏度。
2、She woke up and found herself in a hospital bed.她醒来发觉自己躺在医院的床上。
3、I think it's time to go to bed.我想该睡觉了。
4、The geraniums in the flower bed looked bedraggled from the heavy rain.花坛里的天竺葵被大雨浇得七零八落。