Dpk
[医][=dipropyl ketone]二丙基甲酮，4-庚酮
🗣️ 情景例句
It's on the house.
这是免费的。
A fox may grow grey, but never good.
狐狸会变，但本性难移。
When they objected, they were killed.
他们反抗时就被杀害。