前此，大家见过了三字一体片语动词的活力，应该多加留意，顺其自然地在生活中运用，使话语更新鲜，文章更亮丽。

　　据观察，三字一体的片语动词中，含on的相当多。请看下面这段资讯中就有一个常用的含on的三字一体片语动词：

　　The press yesterday quoted the President of the ruling party as saying that failure to crack down on corruption would give the impression that certain powers were being used to protect it. （严禁；严加取缔）

　　下面这些也是常见常用的，不妨学而用之：

　　● cash in on：谋取利益

　　Lets cash in on the fine weather by playing some outdoor games we like.

　　● break in on/ burst in on：干扰

　　The loud noise of the quarrel between the two neighbours broke in on childrens sleep.

　　● zero in on：对准目标

　　The members of the Opposition Party zeroed in on the governments new bill.

　　● clamp down on：施加压力；取缔

　　The government has decided to clamp down on all forms of illegal gambling.

　　● read up on：熟读

　　You need to read up on all the traffic codes before you learn driving.

　　● brush up on：复习

　　Before the examination, remember to sort out the lecture notes to brush up on all the important points.

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