Opv
[醫][=oral polio vaccine]口服脊髓灰質炎疫苗
??? 情景例句
I kissed the top of his dear little head.
我吻著他可愛的小頭頂。
I often go to market in the afternoon.
我常常在下午去市場。
We'll still be able to meet the deadline.
我們還是可以趕上最后期限的。