Mary is sad because she can't sing well.

问题描述:

Mary is sad because she can't sing well.

玛丽很悲伤因为她唱不好歌

玛丽由於不能唱好歌而伤心

玛丽很难过,因为她唱不好歌。

Mary很难过因为没能唱好歌

玛丽很伤心因为她歌唱得不好