Opv
[医][=oral polio vaccine]口服脊髓灰质炎疫苗
🗣️ 情景例句
Do you have any assurance for its quality?
你们有任何品质保证吗？
A word spoken is past recalling.
一言既出，驷马难追。
The gaoler looked on eagerly, anxious to see if his fellow actor had at last learnt his lines.
狱卒热切地观察着，急于想了解他的同事是否记熟了台词。