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用法:1 stretch of land between hills or mountains, often with a river flowing through it 谷, 山谷（中间多有溪流）. =>illus at mountain 见 mountain 插图.
用法:2 region drained by a river 流域:the Nile valley 尼罗河流域.
英汉词典包含54938条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。