Microimpurity
[化] 微量杂质
🗣️ 情景例句
The expressway can lead you everywhere around this region.
高速公路能把你带到这个地区的任何地方。
I didn't realize the time had passed so quickly.
我没有认识到时间这样快速过去了。
Our next obstacle was a shallow pool of water about half a mile across.
下一个障碍是一片约半英里宽的浅水塘。