一、科学课老师讲解了关于大气的知识,一起和 Susie 了解一下。
The sky is blue. The clouds are white. Does it mean the air is good? No. Maybe there is ozone(臭氧) pollution. There is some ozone in the air, usually 30 kilometres above the ground. It can us from the UV light. But if there is too ozone near the ground, it becomes a kind of pollution. It is for our health. It is also bad for some plants. from cars and factories can become ozone in strong sunlight. So when it is sunny and hot, there may be more ozone in the air in the city. What can we do? less! If there is too much ozone in the air, stay until sunlight is not so strong.
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