Opv
[医][=oral polio vaccine]口服脊髓灰质炎疫苗
🗣️ 情景例句
I have a question.
我有一个问题。
He gave a straightforward answer.
他给予了坦率的回答。
The building of skyscrapers in New York began around the year 1900.
在1900年左右，摩天楼开始在纽约兴建。