Commutativity
[计] 可交换性
🗣️ 情景例句
Yes, come on.
是的， 过来。
I do not know whether you care to answer right away.
我不知道你是否愿意立即回答。
The most economical age to capture an elephant for training is between fifteen and twenty years,
捕捉15至20岁之间年龄的大象进行驯练最为经济。