Cataloid
胶体二氧化硅
🗣️ 情景例句
The pollution in Beijing is alarming.
北京的污染给人们敲起了警钟。
Take time when time cometh,lest time steal away.
时来必须要趁时，不然时去无声息。
Where are you going tomorrow? You said that you hoped it would be fine.
你明天打算去哪儿？你说你希望明天是个好天呢。