Dibenzphenanthrene
二苯并菲
🗣️ 情景例句
OK. Do you want to get better?
好，你想把病治好吗？
'Tis the early bird that catches the worm.
早起的鸟先得虫；捷足先登。
The study of custom can be profitable only after certain preliminary propositions have been accepted,
只有在某些基本的主张被接受下来、同时有些主张被激烈反对时，