However, doctors continue to puzzle over handedness.
但是，医生们仍然为用手习惯感到不解。
Nevertheless, the bird and fish data do not explain human handedness.
尽管如此，鸟类和鱼类的资料并不能解释人类的用手习惯。
Research has shown that there is a genetic or inherited element to handedness.
研究显示惯用左右手的习惯是一个遗传或是继承的元素。
For the relationship between handedness and speech lateralization, see Chapter four.
惯用手和语言侧化的关系，见第四章。
Until recently, many children were not allowed a free hand when it comes to handedness.
很多小孩不被允许自由地使用左手或右手来学习，一直到最近才有好转。
Until recently, many children were not allowed a free hand when it comes to handedness.
很多小孩不被允许自由地使用左手或右手来学习，一直到最近才有好转。
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