辐射直接使DNA变异，但是我们看到的辐射光大部分是可逆的。
It mutates the DNA directly. But most of what we see seems to be reversible.
基因变异使病毒更适应人类的鼻和喉。
约莫46%的妇女携带该基因的一种变异体，这种变异使该酶的活性年夜年夜增强。
About 46% of women have a version of the gene that contributes to high enzyme activity.
约莫46%的妇女携带该基因的一种变异体，这种变异使该酶的活性年夜年夜增强。
About 46% of women have a version of the gene that contributes to high enzyme activity.
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