Step1: 听句子提取大意
第一句：
第二句：
Step2: 看视频讲解定位问题
第一句视频讲解：
第二句视频讲解：
Step3: 分析句子中没听出来的语言现象并记录生词
第一句
But basically, these reactions cause certain chemicals to be released. And these chemicals reduce the amount of ground-level ozone. So the more branches you have in an ice crystal, the more quasi-liquid layer there is. The more quasi-liquid layer, the more reactions and the more chemicals that reduce ground-level ozone
第二句
Now, as air is heated and becomes warmer, it expands, it becomes less dense. When air in a particular area is heated, you get a concentration of warm air in an area of low pressure. Likewise, when you get a concentration of cold air, that air’s gonna be very dense, so it’s gonna create an area of high pressure.