a large knife with one or more folding blades 同义词：jackknife,
例句与用法
1.
Whilst speaking he produced a dangerous looking clasp knife , quite in keeping with his character , and held it in the striking position 他边说边掏出一把跟他的性格十分般配令人看了毛骨悚然的折叠式刀子，并且摆出刺杀的架势，抡了起来。
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