Injectivity
内射性
🗣️ 情景例句
What do you do for a living, Mr. Stewart?
你是做哪一行的 Stewart先生？
How awful.
多可怕呀！
No, not very. You need a driving permit. Have you got one?
不，不很贵。你需要一个驾驶执照。你有没有？