The formation of lunar rilles remains a mystery.

月球山谷的形成仍是一个谜。

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But there are so many special rilles about real estate that it makes sense to treat this as a separate field of law.

但是关于不动产却有很多专门的法规，所以完全可以把它看作一个单独的法律领域。

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Rilles look like river channels on the lunar surface.

月球表面的山谷看上去像是河道。

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When we see a notable change in the gravity field, we can sync up this change with surface topography features such as craters, rilles or mountains.

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