操作测定 meaning in Chinese

time-and-motion study

The 4 - step ways are as the follows : first , i gave lectures - - introducing the harm to themselves , other people and society of inhaling fumes directly and indirectly . second , in order to strongly impress the students about the harm of smoking , i helped them to determine the poisonous ingredients of the fume in the chemistry lab and get them to see with their own eyes the death of the white mice . third , i intensified their understanding of the harm of smoking by means of " discussion and communication .
这四步无烟教育方法是：第一步，举办知识讲座? ?介绍主流烟雾、侧流烟雾对人对已对社会的危害；第二步，紧紧抓住中学生的心理，充分发挥化学实验室的功能，让学生亲眼看到烟雾毒死小白鼠，亲手操作测定烟雾中的有害成份；第三步，利用“讨论交流”强化学生对烟害的认识；第四步，利用“情景演示”法锻炼、提高学生拒绝烟草的勇气和技巧。