It's a mechanism that they have evolved in order to prevent foreign genes from entering a cell and being expressed.
它们进化出这种机制来,防止异源基因进入细胞并表达
As we'll see in section today, a vaccine does not have to be totally perfect in order to prevent transmission of a disease, because when a disease enters a community its spread from one person to another.
有如我们今天看到的,疫苗不一定非要,绝对完美地阻止疾病的传播,因为当疾病侵入一个社区后,会在人群间传播
In order to keep the currency convertible they had to keep interest rates high to prevent people from demanding the gold.
为了保持货币的转换性,他们不得不将利率提高,以防人们向他们索求金子的兑换。
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