Chemex
化学交换(同位素浓缩)过程
🗣️ 情景例句
Lacks vitality.
缺乏活力。
As you all know, doing business is not an easy thing to do.
大家都知道，做生意并不是一件容易的事。
Thanks. Oh, this is too small. Do you have a big piece, please?
谢谢。噢，这张太小了。请问你有一张大的吗？