Sleeper作名词可指"卧铺车"。此外，sleeper train和sleeper car也可指那种带有卧铺的列车。Overnight作形容词指通宵的，因此overnight sleeper便是通宵卧铺车，也就是那种晚上睡一夜，第二天早上便到达目的地的列车。

[口语天天练之古都西安]

俗话说"不到长城非好汉"， 不过在很多人眼里，不游西安，就等于没游中国哦。当你和外国友人聊起西安时，该如何介绍这座古都呢？快来学学下面这3句话：

1. Xi'an is more than 3,000 years old and was known as Chang'an in ancient times.

西安已有3000多年的历史，古时被称为长安。

2. For 1,000 years, the city was the capital for 13 dynasties, and a total of 73 emperors ruled here.

千年间，13个朝代都建都于此，且共有73个皇帝在此治国。

3. With so much history within the ground the city lies upon, it is no wonder that there are so many historical ruins, museums and cultural relics to be found here.

由于这座城市坐落的土地上曾有过那么多历史，怪不得这里有那么多的历史遗迹、博物馆和文化遗产。