Microimpurity
[化] 微量杂质
🗣️ 情景例句
Learning to express oneself well in an important part of education.
学会把意思表达清楚是受教育的一个重要方面。
I still like to climb trees!
我直到现在还喜欢爬树。
but where had it come from?
但它是从哪儿来的呢？