The results indicate that the surface etched by acid solution is comparative smooth, the surface filled with the uniform etched pits, and very low reflectance.

结果表明酸溶液腐蚀的硅片表面相对平整，有均匀的腐蚀坑，反射率很小。

youdao

A pitfall trap can be any small container placed in the ground with the top level with the surrounding surface and filled with a preservative.

陷阱可以是任何放置在地面上的小容器，其顶部与周围的表面齐平，并装满防腐剂。

youdao

As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.

与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。

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The initial "push" upward by the cold front on that balloon filled with surface air is like a child letting a helium-filled balloon go -- it just keeps rising.

CNN: The making of a nightmare tornado

The researchers believe that as the cold wave moves from the surface, the rock pore space is completely filled in.

BBC: Doubts over water on Mars

Then they move the plants to a darker environment to encourage flowering and the formation on the surface of its buds, leaves and stems of trichomes, tiny resin-filled glands resembling sea anemone.

WSJ: The Pot Business Suffers Growing Pains