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That Heavy Sack Of Presents
背重物
You should never carry something that weighs more than 10 percent of your body weight, especially when one shoulder is taking on most of the burden. In fact, doing so can cause back strains and sprains, muscle pulls, back spasms, difficulty walking and tingling and numbness down the arms and legs.
不要背超过自己体重10%的重物，尤其不要单肩背。背重物会导致背部拉伤和扭伤，肌肉拉伤，背部痉挛，行走困难，感觉刺痛，四肢麻木。
