Thiaindan
苯并二氢噻吩
🗣️ 情景例句
and one of them is Columbia.
其中一所是Columbia大学。
My brother wants to learn how to speak Chinese.
我的兄弟要去学中国话。
I'll have to stay at the office.I don't know when I'll finish.
我不得不留在办公室，不知道什么时候才能结束。