Messenger has already been able to return a partial map of the planet's crater-filled surface after just a handful of flybys.

信使号在近距离探测一段时间后就能发回水星那凹凸不平表面的局部地图。

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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。

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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.

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

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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.

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