Lead deposits, which accumulated in soil and snow during the 1960s and '70s, were primarily the result of leaded gasoline emissions originating in the United States.
2
在十九世纪六七十年代，芝加哥标榜其凉风习习，是夏日避暑的理想场所。
In the eighteen sixties and seventies, Chicago was advertised as an ideal place to visit in the summer because of this cool wind.
3
这部电影是以六七十年代为背景的，我对于回到那时非常的严肃，非常紧张。
The movie was set in the '60s and' 70s, and I was very severe back then, very anxious.
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