Injective
[计] 内射, 单射
🗣️ 情景例句
They're in my office.
在我办公室。
When an opportunity is neglected,it never comes back to you.
机不可失，时不再来；机会一过，永不再来。
I have breakfast at 7:00 and then I go to school.
我七点吃早餐，然后去上学。