Coextension
n. 同等扩张, 同等延伸
🗣️ 情景例句
This is a good deal: buy 1, get 1 free.
这可是个好买卖：买一送一。
Let's keep in touch.
让我们保持联系。
I want to go to the shop. I want an eraser.
我想去商店买块橡皮。