经济低迷时期，工厂排放的污染少了，上班的人少了，意味着意外交通死亡也少了。
During recessions, idled factories spew less pollution and fewer people commuting to jobs means fewer traffic deaths.
经济低迷时期，工厂排放的污染少了，上班的人少了，意味着意外交通死亡也少了。
During recessions, idled factories spew less pollution and fewer people commuting to jobs means fewer traffic deaths.
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