Seroconversion
n. [生][医]血清转化
🗣️ 情景例句
I see how people spend their leisure time--
我看到人们怎样利用闲暇时间
How often do you eat out?
你隔多久在外面吃一次饭？
What do the farmers do with your machines?
农民用机器做什么呢？