Commutations
(commutation 的复数) n. 交换, 变换, 代替\\n[电] 整流
🗣️ 情景例句
When do you need the volunteers,
你们什么时候需要义工
The post office is in the middle of the block, You can't miss it.
那邮局就在街区的中间，很好找。
In ordinary living, there can be some tolerance of unpunctuality.
在日常生活中人们可以容忍一定程度的不准时。