family immunity是什么意思 family immunity怎么读
family immunity的用法和样例
- The immunity achieved is generally brief and must be boosted.
所获得的免疫性一般是短暂的，须激发注射。 - Hepatitis A is endemic in most developing countries, and most children are exposed and develop immunity at an early age.
型肝炎是大多数发展中国家的一种地方病，而大多数孩子因为在很小的时候曾患病而具有免疫性。
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