knife-edge

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