史提夫：这对环境很糟糕，汽车制造很多污染。
STEVE: It's too bad for the environment. So much pollution from cars.
史蒂文：我觉得我们国家最大的环境问题是空气污染。
Steven: I think the biggest environment problem in my country is air pollution.
史蒂文：我们这些年也在减少有害气体排放量，但是汽车废气排放依然是空气污染的主要原因。
Steven: We have reduced emission of air pollutants in recent years, but cars are still a major source of them.
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