| 单词 | knapsack | 
| 释义 | knap·sack   (năpsăk′) n.  A bag made of sturdy material and furnished with shoulder straps, designed for carrying articles on the back. [Probably Low German Knappsack : knappen, to bite (probably of imitative origin) + Sack, bag (from Middle Low German sak, from Old High German sac, from Late Latin saccus; see  SACK1).] | 
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