By functional group I mean an alcohol group or ketone group or aldehyde group or acid group.

官能团指酮醛。

Acetone has a ketone group and it's called 'acetone' because it was derived from acetic acid, which is vinegar, the most common carboxylic acid in your kitchen.

丙酮有一个酮，之所以称为“丙酮”，因为它从醋中提取的，醋房中最常见的羧。

Beta hydroxybutyric acid on the other hand, even though it's still one of the ketone bodies, isn't technically a ketoacid since its ketone group has been reduced to a hydroxyl group.

而β-羟丁虽说也酮体，但却不酮，因为它的酮团被还原成了羟。

After that happens, the liver turns the fatty acids into ketone bodies, like acetoacetic acid and beta hydroxybutyric acid; acetoacetic acid is a ketoacid because it has a ketone group and a carboxylic acid group.

此后，肝把脂肪转化成酮体，比如乙酰乙、β-羟丁；乙酰乙一种酮，因为它有酮团和羧团。