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hard pan英英字典_hard pan剑桥英语解释_hard pan柯林斯英文解释_零六五六深蓝词典
零六五六深蓝词典

hard pan

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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