The reaction mixture is then heated to reflux for 2 hours while stirring. After being cooled to about 20 c, it is poured into 5 litres of ice water.是什么意思_The reaction mixture is then heated to reflux for 2 hours while stirring. After being cooled to about 20 c, it is poured into 5 litres of ice water.在线翻译_英语_读音_用法_例句