| 单词 | slip face | 
| 释义 | > as lemmasslip face   slip face  n. the steepest face of a sand dune, down which sand slips. ΘΚΠ the world > the earth > land > landscape > high land > slope > 			[noun]		 > sandy sand-wash1901 slip face1941 1941    R. A. Bagnold Physics of Blown Sand & Desert Dunes xiv. 224  				The seif dune differs more markedly from the barchan in that its slip-face, instead of running mainly transverse to the prevailing wind, runs parallel with it. 1976    Nature 22 July 284/2  				The beetles either burrowed into dune slipfaces when returned or remained active. < as lemmas  | 
	
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