Moreover, even though humans have been upright for millions of years, our feet and back continue to struggle with bipedal posture and cannot easily withstand repeated strain imposed by oversize limbs.

 
  • 此外,尽管人类直立行走已达百万年之久,我们的脚和背总是很费劲地保持两脚站立的姿势、难以经受过大的身材带来的反复巨大压力。
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