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hardpan英英字典_hardpan剑桥英语解释_hardpan柯林斯英文解释_2020年的事情英文词典
2020年的事情英文词典

hardpan

H 开头单词

柯林斯词典

    hardpan /ˈhɑːdˌpæn/

  • 1. N a hard impervious layer of clay below the soil, resistant to drainage and root growth 硬质地层

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