Combinatorics
n. 组合学,组合数学
🗣️ 情景例句
When Alexandra arrives,
等Alexandra到达时，
If you cannot bite, never show your teeth.
不能打仗，切莫出兵。
Assuming that his family had been killed during an air raid, Hans settled down in a village fifty miles away where he had remained ever since.
汉斯以为全家人都在空袭中遇难，于是便在距此50英里外的一座村子里定居下来，直至当日。