Violanthrole
二苯并羟蒽
🗣️ 情景例句
I have no definite ideas in that area right now.
在这方面目前我还没有具体的想法。
Fear is often greater than the danger.
杞人忧天。
the varieties are infinite; but two classes may be roughly seen.
鸟的飞行方式千差万别，但大体上可分为两类。