Dibenzphenanthrene
二苯并菲
🗣️ 情景例句
May I make a suggestion?
我可以提个建议吗？
Would you please give us a rough idea of the quantity you require?
请告知你方大概要订多少？
I have just received a letter from my brother, Tim.
我刚刚收到弟弟蒂姆的来信，