他的儿子被注射了强效的药。
这种强效的药物用于使手术中的病人失去知觉。
This powerful drug is used to tranquilize patients undergoing surgery.
但是强效的中药在治病的同时也可能带来危害。
So, if you were someone that was getting it after it had been passed through many people, you wouldn't have as strong or as lengthy a protection as the first individual did.
如果一个疫苗经过很多人的传递,再接种到你身上,你不会获得像第一个接受疫苗的人,那样强效持久的免疫效果
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