knife-edge
短语n. 刀口, 锐利物, 刃状物
发音
其它
词形变化
knife-edges
复数
别名
knife edge
knife's edge
释义与例句
n.
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1.
A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.
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2.
A precarious balance that could be upset by a very small force in either direction.
比喻The game was on a knife-edge.
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3.
Used other than figuratively or idiomatically: the edge of a knife.