The researchers warn that excessive pressure on the shoulder from weighty backpacks may lead to shoulder pain, and an uneven backpack load may lead to low back pain.

 
  • 研究者警告说:沉重的书包给肩部施以过多的压力,导致肩部疼痛。承重不均衡的书包会造成腰背部疼痛。
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