4.break down损坏，不能运转；身体垮掉；失败；崩溃；拆毁，拆除；分解

　　[教材原句]First，his two sledges broke down，and then the horses began to have serious difficulties with the snow and the cold.

　　先是他的两个雪橇坏了，接着马匹开始应付不了大雪和严寒的天气。

　　写出下列句中break down的含义

　　①He had to pause from time to time to wipe the sweat from his forehead，because the air-conditioning system broke down.

　　____________ ②The firemen broke down the wall in order to gain quick access to the building on fire.

　　____________ ③He is showing signs that he might break down.

　　____________ ④It's reported that peace talks have broken down in the Middle East. ____________ ⑤Bacteria break down the animal waste to form methane gas (沼气). ____________ 答案　①损坏，不能运转　②拆毁，拆除　③身体垮掉

　　④失败　⑤分解 [句 式 透 析] 1.[教材原句]Although people enjoyed reading his book，many of them thought that Marco's stories about China were too fantastic to be true.

　　尽管人们喜欢读他的书，但是很多人认为马可讲的关于中国的故事太离奇了，令人难以置信。

　　(1)句中的too...to...结构，意为“太……而不能……”，too后面跟形容词/副词，但当其后接形容词修饰单数可数名词时，要把不定冠词a(n)放在形容词之后。 `①If the population continues to increase，the earth will become ________________ so many people.

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