These backpacks are designed to carry a heavy load.
这些背包是为携带重物设计的。
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。
Backpacks can influence your health.
背包会影响你的健康。
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。
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”。
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。
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”。
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。”
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。
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？
Alden then started designing headphones into helmets, backpacks—anywhere that would make it easy to listen to music while snowboarding.
然后奥尔登开始在头盔、背包里设计耳机——可以在滑雪时听音乐的任何地方。
These are rulers and those are backpacks.
这些是尺子，那些是双肩包。
We stored our backpacks and found our seats.
我们把背包存放好，找到了座位。
How many backpacks have you owned since you went to school?
自上学以后，你有过多少个背包？
Some advice on how to carry backpacks comfortably and safely.
一些关于如何舒适安全地背背包的建议。
As we know, most backpacks are produced from different materials.
我们知道，大多数背包是由不同的材料制成的。
Here's some advice to help you carry backpacks comfortably and safely.
这里有一些建议可以帮助你舒适安全地背背包。
Smaller lunch boxes are preferred because they fit easily into backpacks.
人们更青睐较小的午餐盒，因为它们能轻松装入背包里。
Backpacks have become common and popular among students in the past 30 years.
在过去的30年里，背包在学生中变得普遍和流行。
It is such wonderful idea that you can put your old backpacks online for sale.
你可以把旧背包放在网上出售，这是一个很棒的主意。
Five years ago, a research showed that 85% of the old backpacks ended up in rubbish.
五年前，一项研究表明，85%的旧背包最终被扔进了垃圾桶。
If your backpacks become old, will you just treat them as rubbish and throw them away?
如果你的背包变旧了，你会把它们当作垃圾扔掉吗？
Some students pull wheeled bags filled with heavy textbooks and others carry backpacks.
一些学生拉着装满沉重课本的带轮书包，其他人则背着书包。
All in all, old backpacks are still of great value as long as we put them into use wisely.
总之，只要我们合理使用，旧背包仍然有很大的价值。
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