在河中可见一块大石头,石头表面有几个园形坑,它们是在距今248万年以来更新世时期冰雪融化、洪水期间强大涡流作用形成的。
Potholes on riverbed rock
There are some potholes on rock surface. These potholes were formed by the powerful eddy currents during the glacier melting and flooding periods since the Pleistocene (2.48Ma ago).
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