| 单词 | crustation | 
| 释义 | crustationn.  The formation of a crust; an incrustation. ΘΚΠ the world > space > relative position > condition of being external > covering > coating or covering with a layer > 			[noun]		 > a coat or covering layer > a crust or incrustation > formation of crustationa1652 incrustation1656 a1652    I. Jones Most Notable Antiq. called Stone-Heng 		(1655)	 37  				These, having through long time, got the very same crustation upon them. 1698    J. Keill Exam. Theory Earth 		(1734)	 235  				The Abyss was enclos'd by a thick Crustation, in which were all the Materials of Earth, Sand, Clay, Gravel [etc.]. 1870    Eng. Mechanic 21 Jan. 463/1  				To attempt to remove crustations. This entry has not yet been fully updated (first published 1893; most recently modified version published online March 2018). < | 
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