| 单词 | boulder clay |
| 释义 | boulder /bōlˈdər/noun
Containing boulders ORIGIN: Origin obscure; Swed dialect bullersten, large stone in a stream, has been compared bouldˈering noun Climbing carried out on large boulders boulder clay noun A stiff stony mass of finely ground rock, usu containing boulders and pebbles, deposited as a ground moraine under land-ice |
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