Invertibility
[计] 可逆性
🗣️ 情景例句
Everybody help yourselves.
大家请便吧。
I gave her my address and she gave me hers.
我把我的地址给她，她也把她的给了我。[九六广州初中会考]
It went direct from my local station and the journey lasted mere hour and seventeen minutes.
这是趟直达车，旅途总共才需1小时17分钟。