Combinatorics
n. 组合学,组合数学
🗣️ 情景例句
Cry on my shoulders.
把委屈告诉我吧。
That cat judged the distance before he leapt across the ditch.
猫在越过沟渠以前便判断好其距离了。
it is extremely difficult to estimate the true value of the services which people perform for us.
但要估算别人为我们为所提供的服务的价值却是极其困难的。