对岩石薄片的 X 射线检查有时会发现可怕的触角轮廓、消化道和很多种海洋生物的视觉器官。

X-ray examination of thin slabs of rock sometimes reveals the ghostly outlines of tentacles, digestive tracts, and visual organs of a variety of marine creatures.

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然而，他们虽然仍呼吸着空气，却从未进化出类似于腮这种早期海洋生物的器官。

They do, however, still breathe air, having never developed anything equivalent to the gills of their earlier marine incarnation.

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他们对生物器官与组织细微结构进行研究。

They study these microscopic structures of tissues and organs.

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