backpackWiktionary 原文/ˈbæk.pæk/n.远足用的背包；双肩背包，背包中文释义来自 ECDICT构词拆解backback词干packpack词干词源说明From back + pack. First attested in 1896.释义名词noun1A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person’s back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books.2A similarly placed item containing a parachute or other life support equipment.