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v.对折，用折叠刀切( jackknife的过去式和过去分词 )； 英英释义： jackknife[ 'dʒæknaif ]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 waist at
