Seroconvert
vi.[生][医]血清转化(对疫苗产生抗体)
🗣️ 情景例句
I don't have time to take any elective classes.
我没有时间去上任何选修课。
It is harder to marry a daughter well than to bring her up well.
养女容易嫁女难。
What size do you want?
你要多大号的？