knife-edge

名词 knife-edge:

1. a narrow boundary
2. the sharp cutting side of the blade of a knife
   同义词：knife edge, cutting edge

1. The success of the project is still very much on a knife-edge.
   这一项目的成败目前仍处於关键时刻。
2. He's on a knife-edge about his exam results.
   他对考试成绩十分担心。

knife-edge

n.（名词）
A sharp cutting edge.
刀刃，锋刃：锋利的、切割的刀刃
A sharp, narrow edge or border:
摇摆不定的处境；极微妙的状态：锋利而狭窄的边或边缘：
例句：
.saying lines that teeter on the knife-edge between literature and lunacy.(Vincent Canby)
.吟咏着处在文学与疯人呓语徘徊的诗句.(文森特·坎比)

A wedge of metal used as a low-friction fulcrum for a balancing beam or lever.
刃形支承：一种楔形金属，用作平衡木或杠杆的摩擦小的支撑物