At four months babies can grasp objects with their hands.

四个月大时就能用手抓东西。

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Opposable thumbs are essential because they give people the ability to grasp objects.

对生拇指非常重要，因为人们需要依靠拇指来抓取物体。

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Opposable thumbs are essential because they give people the ability to grasp objects.

对生拇指非常重要，因为人们需要依靠拇指来抓取物体。

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