回溯长度
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track back length
回径长度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Options for reducing the length of the there-and-back journey include hitching a jetboat ride south with Hollyford Track Guided Walks for the length of Lake McKerrow (book in advance).
BBC: New Zealand��s tracks less travelled
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