重点讲解：
1. it's fair to say
可以说；应该说；
eg. I think it's fair to say that it didn't sound quite right.
我想应该说那听起来可不太对。
eg. It's fair to say you could be mistaken.
可以说，你可能是弄错了。
2. in common
共同的，相同的；
eg. The oboe and the clarinet have got certain features in common.
双簧管和单簧管有些相似之处。
eg. He had very little in common with his sister.
他和姐姐几乎没有什么共同语言。
3. that depends
视情形而定；看情况；
eg. That depends. How much do you want?
那要看情况，你要多少？
eg. Whether we will attend the meeting, that depends.
我们是否出席会议要看情况而定。
