第 77 课: 使用更多的介词：在...上面（上方），在...下面（下方）等-4

Many people are coming down, but only a few are going up. 很多人在下楼，但是有几个在上楼

Only a few people are coming down, but many are going up. 只有几个人在下楼，但是很多人在上楼

There are many balloons in the sky. 天空中有很多气球

There are only a few balloons in the sky. 天空中只有几个气球

Many people are sitting on chairs. 很多人坐在椅子上

Only two people are sitting on chairs. 只有两个人坐在椅子上

Only one person is sitting in a chair. 只有一个人坐在椅子上

Nobody is sitting in a chair. 没有人坐在椅子上