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关注：1
2013-05-23 12:21
求翻译：In the early 1970s,EPAmandated themanufacture and sale of unleaded gasoline. As the use of unleaded gasoline became widespread, ambient air lead levels were dramatically reduced.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
In the early 1970s,EPAmandated themanufacture and sale of unleaded gasoline. As the use of unleaded gasoline became widespread, ambient air lead levels were dramatically reduced.
问题补充： |
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2013-05-23 12:21:38
正在翻译，请等待...
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2013-05-23 12:23:18
在20世纪70年代初， EPAmandated无铅汽油themanufacture和销售。当使用无铅汽油变得普遍，环境空气显著减少了主角水平。
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2013-05-23 12:24:58
在70年代初期， EPAmandated无铅汽油themanufacture和销售。 当对无铅汽油的用途变得普遍，自由流通的空气显著减少了主角水平。
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2013-05-23 12:26:38
在七十年代初期，EPAmandated 到制作和销售的无铅汽油。当无铅汽油的使用变得普遍，环境空气铅含量大大减少了。
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2013-05-23 12:28:18
正在翻译，请等待...
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