Chemex
化学交换(同位素浓缩)过程
🗣️ 情景例句
I happen to have
我这儿碰巧有一项
He might have been held up in a traffic jam.
他可能因交通阻塞而耽搁了。
' I continued driving and after some time,the examiner tapped loudly,
”我继续往前开着。过了一会儿，主考人砰砰地敲了起来。