Acetoacetate
乙酰乙酸
🗣️ 情景例句
My father likes going fishing and hunting in his spare time.
我父亲喜欢在业余时间钓鱼和打猎。
Enough! I don't want to hear it!
够了，不要再说了！
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。