求翻译：然后呈现居民生活垃圾，生活污水，工业废水，废渣以及大量的空气污染以及能源污染，利用前后鲜明的对比引起学生的注意，集中学生注意力是什么意思？

Then presents the household waste, sewage, industrial waste water, waste, and a lot of air pollution and energy pollution, the use of before and after in sharp contrast to the students 'attention and focus students' attention

And then a life of the population refuse, sewage, industrial wastewater, and waste, as well as a large number of air pollution and pollution from energy use before and after, and the contrast between the notes, students focus on students' attention

Then presents the inhabitant to live trash, the sanitary sewage, the industrial waste, the waste residue as well as the massive air pollution as well as the energy pollution, around the use the sharp contrast brings to student's attention, centralized student attention

And then rendering residential house refuse, sewage, industrial waste water, air pollution and waste, as well as a large number of energy pollution, use before and after contrast student attention, focus student attention

正在翻译，请等待...