Dibromoacetone
二溴丙酮
🗣️ 情景例句
How long has he held office?
他已任职多长时间了？
We should weep for men at their birth and not a t their death.
我们应在人降生时流泪，而不该在人死亡时哭泣。
Excuse me，Sir.
先生，对不起。