求翻译：The Tongass National Forest is the largest unit in the national forest system, almost 17 million acres. Tongass employees work to balance multiple uses of the forest resources. The Tongass has healthy fish and wildlife populations, clean water, trees to support local industry, recreation opportunities unique to Alaska, and plenty of unspoiled beauty and solitude. What roads exist in Southeast Alaska have been developed from forest roads built to reach timber. Here are a few of the projects the Forest Service is involved with.是什么意思？

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