Microimpurity
[化] 微量杂质
🗣️ 情景例句
How about a date with your grandfather?
和你爷爷约个会好吗？
In college I majored in philosophy, What was your major?
大学时我主修哲学，你主修什么呢？
He say he'll write a letter soon. He hopes we are all Well.
他说他很快会写信的。他祝我们大家身体好。