Anthanthrone
[化] 二苯并[cd,jk]芘-5,10-二酮
🗣️ 情景例句
If you want my advice, I would...
依我看，……
Better some of a pudding than none of a pie.
聊胜于无。
Excuse me. Where's North Street Hospital, please?
请问，北街医院在哪儿？