Biacetyl
联乙酰, 2, 3一丁二酮
🗣️ 情景例句
This is heaven, Harry!
这简直是天堂， Harry！
I ate too much candy. I have a toothache.
我吃了太多的糖果。牙齿在痛哩。
the necessary method of study is to group the relevant material and to take note of all possible variant forms and conditions.
应采取的研究方法是，把有关各方面的材料汇集起来，同时注意任何可能出现的异常情况和条件。