Combinatorics
n. 组合学,组合数学
🗣️ 情景例句
He's teething.
他正在长牙齿。
It is desirable to apply to good schools.
申请好学校是令人向往的。
and another 700 for the survivors to be reduced by half again.
剩下的一半人再过700年，才会又减少一半。