1. a couple o

三两个…；一对…

eg. A couple of old women were chinning in the corner.

几个老太婆在角落里聊天。

eg. Whereas if only I and a couple of other people like it, then it must be really something special.

然而，如果只有我自己和几个别的什么人喜欢，那么它一定真的很特别了。

2. try on

试穿；试验

eg. Can I try on this jacket?

我可以试穿这件夹克吗？

eg. Sometimes they will try on a dozen or more pieces before deciding to buy a single outfit.

有时候，在购买一套衣服之前，她们会试穿一打甚至更多件衣服。

3. concentrate on

集中精力于；全神贯注于

eg. In doing so, businesses will be able to concentrate on what they know how do best: their business.

这样，事情将能够集中在他们知道如何做得最好的事情上：他们的业务。

eg. In this tutorial we concentrate on the results of compounding rather than the mathematics behind it.

在这份指南里我们集中在结果上而不后面的数学计算。