Naphthophenanthrene
二苯并蒽
🗣️ 情景例句
Is the boss coming by?
是老板过来了吗？
ON. It gets bright.
合上开关，它就会变亮。
We are always willing to cooperate with you and if necessary make some concessions.
我们总是愿意合作的，如果需要还可以做些让步。