卧铺是火车或长途汽车上可以躺着睡觉的床位。

A 卧铺 is a bed on a train or long-distance bus where you can lie down to sleep.

坐长途火车的时候，很多人喜欢买卧铺，这样晚上可以睡得好一点。

When taking a long-distance train, many people like to buy a 卧铺 so they can sleep better at night.