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，肝把脂肪酸转化，比如酰酸、β-羟基丁酸；酰酸是一种酸，因为它有基酸基。

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-羟基丁酸虽说也是，但却不是酸，因为它的基被还原了羟基。

While carboxylic acids are ketones bonded to an OH group instead of an R group, and ethers are just alcohols bonded to an R-group instead of a hydrogen.

虽然酸是与一个羟基（OH）相连而不是与R基相连，而醚则是醇与一个R基相连而不是与氢原子相连。