Dnn
[医][=1，5-dinitronaphthalene]1，5-二硝基萘
🗣️ 情景例句
Life is full of ups and downs.
生活充满起伏。
Johnny doesn't like me.
乔妮不喜欢我。
Class 3 and Class 1 were in front!
他们两人同时传出接力棒。这时3班和1班在前边！