Commutators
(commutator 的复数) n. 换向器, 整流器\\n[化] 对易式; 整流器
🗣️ 情景例句
No admittance except on business.
非公莫入。
Behind bad luck comes good luck.
塞翁失马，焉知非福。
This question is too complicated for me.
这个问题对我说来太复杂了。