求翻译：Each year volunteers come for the cleanup from everywhere. In 2007 alone, 2,945 people picked up 42,330 pounds of trash and _31_ 132 miles of roadway.是什么意思？

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Each year volunteers come for the cleanup from everywhere. In 2007 alone, 2,945 people picked up 42,330 pounds of trash and ___31___ 132 miles of roadway.

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求翻译：Each year volunteers come for the cleanup from everywhere. In 2007 alone, 2,945 people picked up 42,330 pounds of trash and ___31___ 132 miles of roadway.是什么意思？

求翻译：Each year volunteers come for the cleanup from everywhere. In 2007 alone, 2,945 people picked up 42,330 pounds of trash and _31_ 132 miles of roadway.是什么意思？