Tryptic
[生化]胰蛋白酶的
🗣️ 情景例句
I have just begun to learn and my serve isn't very good.
我刚刚开始学习，发球不太好。
You have to change at chicago station.
你必须要在芝加哥站转车。
How would you go to Beijing, by air or by train?
你怎样去北京，是乘飞机还是坐火车？