Chromene
[化] 色烯; 苯并吡喃
🗣️ 情景例句
Thanks, Grandpa. Please sit down.
谢谢你， 爷爷。请坐。
The news spread all over the world.
这消息传遍全世界。
None of us is afraid of difficulties.
我们当中没有一个人害怕困难。