Anthanthrone
[化] 二苯并[cd,jk]芘-5,10-二酮
🗣️ 情景例句
The signs of the city never fail to impress the foreign tourists.
外国游客无一不对该城市留有深刻的印象。
Which one is heavier?
哪一个是较重的？
Thank you.
谢谢。