Sesquiterpenoid
倍半萜(烯)化合物, 類倍半萜烯
??? 情景例句
What do you mean?
是什么意思？
I went to see a friend of mine.
我去看了一個朋友。
I'm very sorry. Usually I'm very careful. I have never lost a book before. It won't happen again.
“很對不起。通常我是非常小心的。我以前從來沒有丟過書。這樣的事不會再發生了。”