Combinatorics
n. 组合学,组合数学
🗣️ 情景例句
Do you want a state-of-the-art machine?
你想要台配置最好的机器吗？
The sun shines all alike.
太阳同样地普照一切。
Even if a piped water supply is safe at its source,
既使管道供水系统在水源处是安全的，