慢速英语:American History: World War II on the Home Front

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词汇讲解：

1. establish vt. 建立;设立;创办
例句：Our hospital was established in 1950.
我们的医院建于一九五○年。

2. cooperate vi. 合作,协作
例句：Let's all cooperate to get the work done quickly.
让我们一起同心协力把这工作快点做完。

3. defense n. 防御,保卫,防护
例句：The shooting was in pure self-defense.
开枪纯粹是为了自卫。

4. refuse vt. 拒绝;拒受
例句：He refused my offer of help.
他拒绝了我的帮助。

5. strength n. 力,力量,力气
例句：The medicine has lost its strength.
这药已经失效。

6. support vt. 支撑,支托
例句：The old man entered the room supported by his grandson.
老人由孙子扶着进了房间。

7. complex adj. 复杂的,错综复杂的
例句：It was a complex problem.
这是一个复杂的问题。