You would first get exposed in children-- in childhood and then at a point when you're susceptible to the disease.
在儿童期这个较容易受病毒感染时期,第一次接触该病毒,就会引起发病
You want to give it to children because it's children that are susceptible, and that's where you would like the vaccine to be useful is in children.
你想把疫苗分发给孩子们,因为他们最易受到感染,同时你也希望,疫苗可以对孩子有效
And children are particularly susceptible to these.
儿童特别容易受到这些病毒的摧残
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