例句與造句

1. More work is needed to uncover whether such a core exists or whether the polycyclic compounds result from the drastic treatments .
   為了揭開這樣一種芳核是否存在，或者多環(huán)化合物是不是由于劇烈處理所引起的問題，必須進行大量的工作。
2. Relationship between the optical activity and the structure of some fused polycyclic compounds
   一些多環(huán)稠合化合物的旋光性和結(jié)構(gòu)的關(guān)系
3. It's difficult to find polycyclic compound in a sentence. 用polycyclic compound造句挺難的