Opv
[医][=oral polio vaccine]口服脊髓灰质炎疫苗
🗣️ 情景例句
They talk about things like family, work, school or sports.
他们常常谈论家庭，工作，学校或运动。
Riches do not always bring happiness.
富未必永远带幸福。
Good morning, doctor.
医生，早上好。