按现行高中教材（人教版）学生实验“钠跟水反应”的做法，往往感到既费时间，又费药品，效率不高。特别是第二步操作，学生没有经验，在铝箔上扎孔太大、太小或位置不准等，会造成失败或事故。我对上述学生实验进行了如下改进，实验时间从改进前的7min减少到大约2min，效果较 According to the current high school teaching materials (PEP) students experiment “sodium with water reaction” approach, often feel both time-consuming and expensive drugs, inefficient. Especially the second step, students have no experience in the aluminum foil hole too large, too small or not allowed to position, will result in failure or accident. I made the following improvements to the students’ experiments: the experiment time was reduced from 7min before improvement to about 2min, the effect was better