重点讲解：
1. in total
总共；总计；
eg. We may get something in total, but averaging it out, each of us will get only next to nothing.
总起来讲，我们能得到一些，但平均起来每个人几乎一无所得。
eg. This dissertation is divided into four chapters, about 15000 words in total.
全文分为四章，共15000余字。
2. one-off
一次性的；
eg. Her novel was just a one-off — she never wrote anything as good as that again.
她的小说是她绝无仅有的作品——后来她再也没写出那样好的东西。
eg. It was just a one-off; it won't happen again.
这事绝无仅有；不会再发生了。
3. be popular with
受欢迎；受喜爱；
eg. These artistic handicrafts are very popular with foreign friends.
外国朋友很喜欢这些美术工艺品。
eg. Chocolate sauce is always popular with youngsters.
巧克力酱总是深受年轻人的喜爱。
