Combinatorics
n. 组合学,组合数学
🗣️ 情景例句
You do. You do. There's a book here.
当然 ，当然。书要出版。
I'm going to wear my blue suit.Is that all right?
我想穿我蓝色的西装，那合适吗？
Could you explain exactly what you do?
您能确切的解释一下你做些什么吗？