Combinatoric
a. 【数学】组合学的
🗣️ 情景例句
What's your regular practice concerning terms of payment?
你们常用什么付款方式？
He brushes his teeth.
他在刷牙。
I say, let's go out for a drive next Sunday.
我说，咱们下星期天开车出去兜兜风吧。