Opv
[医][=oral polio vaccine]口服脊髓灰质炎疫苗
🗣️ 情景例句
What a wonderful morning!
多么美好的早晨！
Do you know when the next exam is?
你知道下次考试在什么时候吗？
It has belonged to our family for a long time.
我们家有这件乐器已经很久了，