Commutativity
[计] 可交换性
🗣️ 情景例句
The rules ought to be observed.
这些规则就予以遵守。
Good health is above wealth.
健康重于财富。
Experiments have proved that children can be instructed in swimming at a very early age.
实验证明，儿童在很小的时候就可以开始学习游泳。