Combinatorics
n. 组合学,组合数学
🗣️ 情景例句
if he spends less on the cultural programs.
假如他在这文化活动上减少开支的话。
As the tree falls, so shall it lie.
自作自受。
I received an invitation, but I did not accept it.
我收到-份请帖，但没有接受。