May feel sad because of some reason.
可能因为某个理由而伤心难过。
DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.
DNA是我们看起来像我们的父亲和母亲的根本原因，因为我们得到一些他们的DNA来形成我们自己的。
DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.
DNA是我们看起来像我们的父亲和母亲的根本原因，因为我们得到一些他们的DNA来形成我们自己的。
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