| 单词 | rack block | 
| 释义 | > as lemmasrack block   rack block  n. Nautical a wooden frame containing several sheaves (sheave n.1 2a). ΚΠ 1794    D. Steel Elements & Pract. Rigging & Seamanship I. 156  				Rack-blocks are a range of small single blocks, made from one solid. 1867    W. H. Smyth  & E. Belcher Sailor's Word-bk. 557  				Rack-block, a range of sheaves cut in one piece of wood, for running ropes to lead through. 1927    G. Bradford Gloss. Sea Terms 136/2  				Rack block, a series of fairlead sheaves set in a piece of wood. 1989    tr.  W. zu Mondfeld Hist. Ship Models 320  				Spritsail clew lines belayed to a cleat in the head before 1720, and later reeved through the gammon lashing or rack block and belayed to a timber head on the forecastle. < as lemmas  | 
	
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