lead content was gradually reduced until it was eliminated a的翻译是：什么意思？中文翻译英文，英文翻译中文，怎么说？-青云在线翻译网

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匿名	关注：1 2013-05-23 12:21 求翻译：lead content was gradually reduced until it was eliminated altogether in 1978 (in the United States)是什么意思？待解决悬赏分：1 - 离问题结束还有 lead content was gradually reduced until it was eliminated altogether in 1978 (in the United States) 问题补充：

匿名	2013-05-23 12:21:38 正在翻译，请等待...

匿名	2013-05-23 12:23:18 逐渐减少了铅含量，直到它在1978年一共被消灭了(在美国)

匿名	2013-05-23 12:24:58 逐渐减少了铅含量1978年，直到它一共被消灭了 (在美国)

匿名	2013-05-23 12:26:38 铅含量逐渐减少直到它消除了一共在 1978 年 (美国)

匿名	2013-05-23 12:28:18 铅含量逐渐降低,直到它完全消除了在1978[美国]

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求翻译：lead content was gradually reduced until it was eliminated altogether in 1978 (in the United States)是什么意思？