N-COUNT (登山或遠足時用的)背包,旅行包 A
rucksack is a bag with straps that go over your shoulders, so that you can carry things on your back, for example when you are walking or climbing.
(登山或遠足時用的)背包,旅行包 [British] SYN backpack,
pack,
knapsack,
kitbag in AM, usually use 美國英語通常用 knap-sack, pack, backpack
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Image of rucksack