The economy is balanced on a knife-edge.
经济形势尚不明朗。
牛津词典
His future remains on a knife edge...
他前途未卜。
The game is poised on a knife-edge. One mistake or one piece of good luck could decide it.
比赛形势扑朔迷离。一个失误或是一点运气就有可能决定胜负。
Tonight's knife-edge vote could be uncomfortably close.
今晚投票的结果很难预料，双方实力可能会很接近，这令人紧张不安。
In this paper, a new combined pipe head seal with fully enclosed knife edge is introduced.
介绍了一种最近研制成功的新型全封闭刀口联合式管口封.
期刊摘选
His future remains on a knife edge.
他前途未卜。
柯林斯例句
"he lived on a knife-edge between genius and insanity"