1. 刀口：刃夹 knife clip | 刀口 knife edge | 刀口枢轴 knife edge pivot
2. 刃形支承,刀刃,刀边：kit 套件 | knife-edge 刃形支承,刀刃,刀边 | kryton 氪
3. 刀棱：klaprothine 天蓝石 同lazulite | knife edge 刀棱 | knots 木纹瑕疵
4. 刀口,刀边,刀刃：knife switch 刀形开关 | knife-edge 刀口,刀边,刀刃 | knife-edge bearing 刀口支承
1. danci.911cha.com
1. " We are on the knife's edge, " he said.
noun
1. the sharp cutting side of the blade of a knife
Synonym: cutting edge