word study
exert,collapse,lauch,operate
（1） exert
vt.尽(力);发挥(威力等);施加(压力等);产生(影响等);行使(职权等)
He has exerted all his strength to attain his goal.
他已尽了全力以达到自己的目标。
He has been exerting a lot of pressure on me to change my mind.
他一直在施加种种压力要我改变主意。
These principles exerted great influence upon the course of the revolution.
这些原则对革命进程产生了很大的影响。
（2） collapse
n.1、倒塌，崩溃，瓦解;
2、(健康等)垮掉，(因精疲力竭等原因)倒下
The storm caused the collapse of the wooden shelter.
暴风雨使这个避风雨的木棚倒塌了。
He suffered from a nervous collapse.
他的精神崩溃了。
The collapse of the government left the country in confusion.
政府的倒台使全国陷入混乱之中。
vi.倒塌，崩溃
The roof collapsed under the weight of the snow.
屋顶被雪压塌了。
The negotiations collapsed after several meetings.
会谈了几次之后，谈判破裂了。
In the last weeks of the war she collapsed from long imprisonment.
在战争的最后几个星期里她的身体因长期监禁而垮掉了。
（3） lauch
vt 1、发射，投射;
2、使(船)下水
The satellite was launched in a rocket.
这颗卫星是由火箭发射的。
The hunter launched a spear at the wolf.
猎人把矛向狼掷去。
A new ship has been successfully launched.
一条新船已成功地下水。
vt ./vi.发动，发起(运动等)
launch out into 开始，着手进行
Our army launched an attack on the enemy.
我们的军队向敌人发起猛攻。
The police launched an investigation into the case.
警察对此案开展了调查。
The research group launched out into a series of new experiment.
研究小组着手进行了一系列新的实验。
（4） operate
vi. 1、运转，起作用;
2、动手术(on,upon)
The elevator operates smoothly.
电梯运行顺利。
The medicine gradually operated.
药物逐渐奏效了。
The doctor operated on the neck of the patient.
医生给病人的颈部动手术。
vt.1、操作，操纵，经营;
2、对。。。动手术
This airline operates five main lines and dozens of branch lines.
这家航空公司经营五条主干线和十几条支线。
Do you know how to operate the machine?
你知道怎么开这台机器吗?
The doctor operated the patient on the neck.
医生给病人的颈部动手术。
He was operated on for lung cancer.
他因肺癌动了手术。