travel by tube

• 乘坐地下火车

travel by tube的用法和样例：

例句

1. Some cities have subways, and airplanes travel all over the country.
   有些城市有地下火车道，还有飞机航行全国各地。
2. When we got off the train in Canton, we were surrounded by curious but friendly Chinese, all staring at us.
   当在广州下火车时，我们被好奇而又友好的中国人所包围，所有人都注视着我们。