... water-tight socket ==> 防水插座,不透水插座 water-tight stratum ==> 不透水地层 water-tight structure ==> 不透水结构 ...
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If the water-tight stratum had already existed, what the groundwater pressure distribution regular in it.
若已知存在不透水层，不透水层内的水压力分布规律如何。
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