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如何科学认识左利手
更新时间: 2020-11-08 00:00:00  

左利手的发生是在胎儿阶段,怀孕四到六个月阶段,由胎儿的姿势导致的。如果右手在身体的下方被压制了,左手会得到更多的血液,就会先发左手。如果婴儿的体位是左手在下,就是右手先发。

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