Subsurface flow is the flow of water underground, in the vadose zone and aquifers.
地下水流是水于地下蓄水层或地下水位线以上的空间流动。
It is the purpose of this book to describe the elements of subsurface-flow theory.
本书的目的是描述地下水流理论的要点。
It is the purpose of this book to describe the elements of subsurface-flow theory.
本书的目的是描述地下水流理论的要点。
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