Dihydrocoumarin
[建] 烷
??? 情景例句
What do you mean?
你是什么意思呀？
What kind of grades did you make in college?
你在學(xué)院得到什么樣的等級？
I know it's not necessary. I want to do it.
我知道不必這樣，可是我愿付？/span>