Opv
[医][=oral polio vaccine]口服脊髓灰质炎疫苗
🗣️ 情景例句
There's a lot in what you say, but we have more urgent problems to deal with.
你说的相当有道理，不过我们有更紧要的事情要办。
How long does it take?
火车要开多久？
Which part of England do you come from?
你从英国的什么地方来？