英语词汇knapsack的发音释义、词根词缀、结构分析、同源词、词频及词根记忆法-英语词根词缀词典

词汇	knapsack
词根词缀	Online Etymology Dictionary knapsack n. c.1600, from Low German Knapsack (Dutch knapzak), probably from knappen "to eat" literally "to crack, snap" + Sack "bag" (see sack, n.1).
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