回流(冷却)
Because the reaction is exothermic, remove the heating device as soon as the mixture begins refluxing. 因本反应为放热反应，当开始回流时即撤去火源。
The refluxing method is better than the soaking method in determing the content of the polysaccharide. 采用回流提取法比模拟泡茶的方法提取的多糖要高。
