英语词汇rucksack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	rucksack
词根词缀	Online Etymology Dictionary rucksack n. 1866, from German Rucksack, from Alpine dialect Rück "the back" (from German Rücken; see ridge) + Sack "sack" (see sack, n.1).
随便看	syring- syringe syringo- syringo-, syring-, -syrinx syrinx Syro- syro- syrup syrupy sys- systaltic system systematic systematise systematization systematize systemic systole systolic systol-, -systole, -systolic, -stole sy-, syn-, sym-, syl- sytem syzygy sy¿- Szechwan

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