In the black volcanic sand was left the trails of their tiny fin prints.
它们在黑色的火山沙上只留下了小小的鳍状印迹。
A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
凝灰岩致密火山灰构成的岩石，大小以细粒至粗砾石不等
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