Sometimes ideas get changed in transmission, and sometimes those changed ideas spread even farther and with more impact than the ideas that came before them.
有时思想在传播中改变,并且时那些被改变的传播得更加广泛,随之带来的影响比思想本身还深远。
Other factors include whether it causes disease, its mode of transmission, whether it can spread from person to person and whether it has spread to urban areas - via blood transfusions, for example.
其他因素包括它是否会致病、它的传播模式、它是否能在人与人之间传播以及它是否会传播到城市(例如通过输血)等等。
Although transmission by large droplets when people cough or sneeze is considered the major route of influenza spread, transmission via contaminated hands may be a contributing factor.
虽然在咳嗽和打喷涕时通过大的飞沫传播被认为是主要的流感传播途径,但是通过受污染的手传播可能是一个促进因素。
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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