Seroconvert
vi.[生][医]血清转化(对疫苗产生抗体)
🗣️ 情景例句
do I really have to
我是不是真的有必要
He has a telephone set.
他有一部电话。
The same policeman was just walking slowly past the entrance, when Patrick asked the same question.
昨天的那位警察正从门口慢慢走过，帕特里克上前问了和昨天同样的问题。