Proconvertin
(血清凝血酶原)转变加速因子前体
🗣️ 情景例句
May I have a bus map, please?
请给我一份公共汽车路线图好吗？
I ought to write a letter.
我应该写一封信。
He simply had no sense of danger at all.
而是他压根儿没有一点儿危险感。