Crotonate
巴豆酸酯, 丁烯酸酯
🗣️ 情景例句
I think I want to study journalism
我想学新闻学
I used to start working at 9:00 o'clock every day.
我过去常在9:00点钟开始每天工作。
You used to smoke 40 cigarettes a day.
他以前每天狂抽四十根烟。