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impervious bed
dril. 不渗透层
eng.geol. 不透水基层〔床〕
hydroel.st. 不透水层
oil 非渗透层; 隔层
tech. 不透水河床; 隔水层; 防渗水河床; 不透水岩层
impervious bed: 12 phrases in 2 subjects
Engineering geology1
Technology11

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