Once on a bus in Peru, a farmer even tied a sheep to the top of the bus.
有一次在秘鲁的一辆公共汽车上，一位农民甚至把一只羊拴在了公共汽车的顶上。
2
We sat on the top deck of the bus.
我们坐在公共汽车的上层。
《牛津词典》
3
One of the best ways of getting to know the town is to take the bus tour, which provides a wonderful viewing experience from one of our open-top buses.