Eskers are very long ridges apparently formed when sub-glacial streams or rivers deposited...
蛇形丘显然是冰下河溪的沉积物堆积而成的很长的垄岗。
Eskers are very long ridges apparently formed when sub-glacial streams or rivers deposited sedimentary materials.
冰下河溪的沉积物堆积而成的很长的垄岗。
Eskers are very long ridges apparently formed when sub-glacial streams or rivers deposited sedimentary materials.
冰下河溪的沉积物堆积而成的很长的垄岗。
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