Doctors cannot effect a cure if the disease has spread too far.
假如这种疾病已扩散得厉害,医生也无法妙手回春。
Cheating can spread like a disease.
欺骗可以像疾病一样传播。
Tracking the spread of a disease is an important step in stopping its outbreak.
追踪疾病的传播是阻止其爆发的重要一步。
The genome could also help farmers avoid Asian soybean rust disease, a highly destructive fungus spread by the wind.
VOA: special.2010.02.02
One can stop spread of disease through a community without being 100% effective in each person who gets the vaccine.
疫苗能够遏制疾病在整个社区中传播,虽然对于每个人来说它并非百分之百有效
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
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