直刀是刀柄带环的刀，也被叫做“环首刀”或“环柄刀”。因其刀刃（刀身部分）不弯翘，所以按形状把这种刀分类为直刀。从西汉到南宋，这种刀，作为一种上好的短兵器而被广泛使用着。
直刀电剪 straight knife machine ; STRAIGHT KNIFE ; STRAIGHT KNIFE M/C
直刀切割机 straight knife cutting machine
直刀裁剪机 Straight knife cutting machine
单刀直入 solo drive ; point blank ; Come straight to the point
直刀裁剪机标准 Straight knife cutting
直车刀架 straight tool holder
模具直线刀面部 land
直肠刀 proctotome ; rectotome
刀尖直径 Point diameter
昨天，我在古玩城买了一把直刀，刀尖有一些突起，有些象雁翎刀，但刀身窄，把锈去掉后。
Yesterday in curio city I bought a sword which has a protuberant point and a narrow body after removing the rust. It looks like a waist saber with feathery pattern on the blade.
他们的从业执照就像没有经验的外科医生手里那冰冷的，不近人情的手术刀，直插那些正在承受悲痛和遭遇的新鲜血肉中。
Their camera lenses are like the cold and indifferent scalpel of an inexperienced surgeon cutting into the still-warm flesh of human grief and suffering.
他对手术刀的挚爱让他自2008年以来一直参加"扔刀片比赛"。
The surgeon's love of the knife has led him to take part in blade-throwing competitions since 2008.
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