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1·These backpacks are designed to carry a heavy load.

这些背包是为携带重物设计的。《牛津词典》

2·Modern backpacks spread the load over a wider area.

新式背包把承重量分散在更大的面积上。《牛津词典》

3·Backpacks can influence your health.

背包会影响你的健康。

4·Backpacks should never be worn over just one shoulder.

永远都不要只把背包背在一边肩膀上。

5·Choose leather backpacks because it looks cool to go to school.

选择皮革背包，因为上学背它看起来会很“酷”。

6·It teaches people how to stay alive without tents, or even backpacks.

它教会人们如何在没有帐篷甚至背包的情况下生存。

7·You think it's cool to carry your backpacks and head out to school.

你觉得背着背包去学校很“酷”。

8·The introduction of backpacks changed the lunch box scene a bit, he adds.

他补充道：“背包的出现有点改变了午餐盒的使用场景。”

9·Research shows that this could be mainly caused by improper use of backpacks.

研究表明，这可能主要是由于使用背包不当造成的。

10·Did you know, for example, that the backpacks that so many students carry today were originally designed for the military?

比如，你知道现在这么多学生背着的背包最初是为军队设计的吗？