Anthanthrone
[化] 二苯并[cd,jk]芘-5,10-二酮
🗣️ 情景例句
There is not a shadow of a doubt that they did it.
毫无疑问，是他们干的。
The distinction of our product is its light weight.
我们产品的特点就是它很轻。
Haven't you heard?
你没听说吗？