Chemex
化学交换(同位素浓缩)过程
🗣️ 情景例句
It's easy to pick something for my colleagues, but it's difficult for my boss.
给同事们的应该不难买，但是给老板的就难罗。
The sewing machine is out of order.
这缝纫机坏了。
Excuse me!
打扰一下。