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1·The telephone system has broken down.

电话系统瘫痪了。《牛津词典》

2·Alex explained that his car had broken down.

亚历克斯解释说他的汽车出了毛病。《牛津词典》

3·Foods are broken down in the digestive tract.

食物在消化道内被分解。《柯林斯英汉双解大词典》

4·Each lesson is broken down into several units.

每一课都分成几部分。《牛津词典》

5·Sugar and starch are broken down in the stomach.

糖和淀粉在胃里被分解。《牛津词典》

6·Negotiations between the two sides have broken down.

双方谈判失败了。《牛津词典》

7·They are made in 10 minutes, used in 20 minutes and normally remain on the earth for over 100 years since they are hard to be broken down.

它们在10分钟内制成，在20分钟内使用完毕，但由于很难被降解，它们通常会在地球上残留100年以上。

8·My car has broken down.

我的汽车出故障了。

9·It could also be broken down into its component parts—oxygen and hydrogen.

它也可以按照组成部分被分解——氧和氢。

10·The shell somehow has to be broken down before this germination ability expires.

外壳必须在这种发芽能力失效之前被以某种方法破坏掉。