My 11-year-old grandsons, Stefan and Tomas, weigh about 80 pounds each. On the 20-minute walk to their middle school and the uphill walk home, they carry backpacks that weigh about 12 pounds each, or 15 percent of their body weight.
我的两个孙子斯蒂芬(Stefan)和托马斯(Tomas)现年11岁,体重都是80来磅(合36公斤)。他们每天要步行去初中上学,回家时还得走一段上坡路,在这段20分钟的路程里,他俩要各自背着12磅(合5.4公斤)的书包,也就是说,书包的重量达到他们体重的15%。
When extra books or clothing, a musical instrument or other equipment are added, the weight they carry can reach 20 pounds. But whatever the figure, those packs are simply too heavy for their still-forming bones and muscles.
如果加上额外的书本、衣服、一件乐器或别的用品,他们要背的书包很可能达到20磅重(合9公斤)。但不管究竟有多重,他们的书包对于仍在发育中的骨骼和肌肉来说,未免过于沉重了。
Heavy backpacks don't just sap children of energy that might be better used doing schoolwork or playing sports. Lugging them can also lead to chronic back pain, accidents and possibly lifelong orthopedic damage.
沉重的书包不仅会消耗孩子们本可以用来更好地做功课或参加体育活动的精力。负担过重,可会导致慢性背痛、发生意外,甚至有可能带来终生的骨骼伤害。
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