It is well known that bed porosities are greater near the bounding surface.

众所周知，靠近边界表面的床层自由空间率较大。

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Let's say that I gave you this curve bounding this surface.

给你这个曲面和这个曲线作为它的边。

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Let's say that I gave you this curve bounding this surface.

给你这个曲面和这个曲线作为它的边。

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