Invertibility
[计] 可逆性
🗣️ 情景例句
I'll get it. Hello.
我去开门。哈啰。
I want to make a long distance call.
我想要打一个长途电话。
namely 6 million million miles.) Radio waves also travel at the speed of light,
即6万亿英里）。无线电波也是以光速传播的。