This resulted in passage of the Clean Air Act of 1970 and subsequent amendments in 1977 and 1990.
这导致了1970年“清洁空气法案”的通过及其1977年和1990年的修订。
One early accomplishment was the Clean Air Act of 1963, and its later amendments, which set goals and procedures for reducing automobile exhaust pollution.
最早通过的是1963年的“洁净空气法”及以后的补充条款，为减少汽车废气污染制定了目标及程序。
One early accomplishment was the Clean Air Act of 1963, and its later amendments, which set goals and procedures for reducing automobile exhaust pollution.
最早通过的是1963年的“洁净空气法”及以后的补充条款，为减少汽车废气污染制定了目标及程序。
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