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课文内容
We have two hands, but why do most people only use their right hand for writing and other difficult activities? We do not know for sure, but the most likely explanation is that we get it from our parents. The genes that decide handedness, however, are still unknown. It could be caused by two genes, or even just one.
It is possible that our tendency for right-handedness goes back to early human history. Women would have held their babies to their left side because of the calming sound of the mother’s heart beat. This left the right hand free to do other things, and have greater skill as a result. This tendency could then have been passed down in human genes.
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翻译
我们有两只手，但是为什么大多数的人只用右手书写以及从事其它困难的活动呢？我们不知道确切的原因，但最可能的解释是这是我们从父母那里学来的。然而，决定惯用手的基因仍然是未知的。它有可能是由两个基因所造成的，或甚至只有一个基因。
我们通常习惯用右手可能要追溯到人类早期的历史。女性会把婴儿抱在她们的左侧，因为这样孩子可以听见母亲让人平静的心跳声。这就使右手空下来去做其它的事情，结果使右手有更好的技能。这种倾向或许就在人类的基因中继承下来了。
Sentence_4u
as a result“结果”，例如：
I was mean to everyone and, as a result, I have no friends.我对每个人都刻薄，结果我没有朋友。
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