第一，迷你对话

A: What are you doing these day?

你这几天，在做什么？

B: I'm brushing up my Japanese.

我在复习日语。

A: Reviewing your Japanese? What for?

复习日语，来干嘛？

B: I'm preparing for the entrance examination of post graduates.

我准备考研。

第二，地道表达

brush up

1. 解词释义

Brush up的意思是“复习”“温习”。

2. 拓展范例

e.g. I shall have to brush up my mathematics before I take on that job.

我接那项工作以前得复习一下数学。

e.g. He needs to brush up on his English before he goes to the U.S.

他去美国之前必须先温习他的英文。

e.g. Eleanor spent much of the summer brushing up on her driving.

埃莉诺这个夏天大部分时间都在练习驾驶技术。

第三，语汇积累

1. the entrance examination of : ......的入学考试

e.g. I heard you had passed the entrance examination of the university.

听说通过了该大学的入学考试。

2. What for? 为什么？
e.g. Did John work hard at college ? What for ?

约翰在大学学习很用功吗？他为了什么？

E.g. "What for?" echoed the girl.

那姑娘模仿他的话：“去干什么？”

3. prepare for：为......做准备

e.g. She decided to forgo the party and prepare for the English exam.

她决定不去参加聚会,为英语考试作好准备。

e.g. I've been out of circulation in order to prepare for the TOEFL.

为了准备托福考试,我已经不从事社交活动。