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rucksack (n.)
[rucksack 词源字典]
1866, from German
Rucksack,
from Alpine dialect
Rück
"the back" (from German
Rücken
; see
ridge
) +
Sack
"sack" (see
sack
(n.1)).
[rucksack etymology, rucksack origin, 英语词源]