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n.摺刀切割，折裂；v.对折，用折叠刀切( jackknife的现在分词 )； 英英释义： jackknife[ 'dʒæknaifiŋ ]n.a large knife with one or more folding blades同义词：clasp knifea dive in which the diver bends to touch the ankles before straightening outv.dive into the water bending the body at the w
