n. 剃刀的锋口, 危急关头, 鲜明的分界线
在线英汉词典

razor-edge的短语、例句：

razor-edge n (also ,razor´s `edge) (fig 比喻) 1 sharp line of division 明显的分界线
a razor-edge of difference between genius and madness 天才和疯狂之截然不同. 2 (idm 习语) on a razor-edge/razor´s edge in a dangerous or critical situation 处於危险的境地; 处於紧要关头
Since he escaped from gaol, Tom has been living on a razor´s edge, terrified of recapture. 汤姆越狱後, 时时如惊弓之鸟, 生怕再次被捕.