Caseidin
n. [生化]酪蛋白免疫素
🗣️ 情景例句
Let's go for lunch. I'm buying.
去吃午饭吧， 我请客。
Do you have some change?
你有零钱吗？
It is only 380,000 kilometres away, and it has been visited by man already.
已经有人到过月球旅行了。