Offering your backpacks to other poor kids is another good choice, as those old backpacks may make their life more convenient than before.
把你的背包提供给其他贫穷的孩子是另一个很好的选择，因为那些旧背包可能会让他们的生活比以前更方便。
Using data from the women's backpacks, researchers reported that airborne levels dropped by more than 50 percent between 1998 and 2006.
使用从孕妇背包得到的数据，研究人员报告在1998年到2006年间空气传播的水平下降了百分之50多。
Using data from the women’s backpacks, researchers reported that airborne levels dropped by more than 50 percent between 1998 and 2006.
使用从孕妇背包得到的数据，研究人员报告在1998年到2006年间空气传播的水平下降了百分之50多。
No one wears backpacks any more. Messenger bags are much more convenient.
现在没人用背包了，单肩挎包更方便些。
The outer frame package price is not very expensive, but also more convenient to fill backpacks.
外架包价格不是很贵，而且填装背包也比较方便。
Their feet are getting antsy and ready to move on, to pack their backpacks and explore more of this beautiful world.
他们的双脚已经蠢蠢欲动，准备打好背包开启下一段旅程，探索这个美丽的世界。
Kids should not carry backpacks that weigh more than 10 to 15 percent of their body weight.
孩子们不应该携带书包重量超过10到百分之十五的体重。
Kids should not carry backpacks that weigh more than 10 to 15 percent of their body weight.
孩子们不应该携带书包重量超过10到百分之十五的体重。
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