Ripple marks, like something you'd typically see on a beach, but they're the size of sand dunes.

波痕，就像你在海滩上常见的那种，但它们的大小却如同般。

These huge ripple marks along the Columbia River near Trinidad, Washington, reveal the impact of enormous amounts of water rushing over the surface.

华盛顿特里尼蒂附近哥伦比亚的这些巨大波痕，揭示了巨量水流冲刷地表的影响。

Geologist Skye Cooley was looking at some LIDAR in the area near Omak and found these giant current ripples.

地质学家斯凯·库利在奥马克附近地区查看激光雷达数据时，发现了这些巨大的水流波痕。