英 [ˈnaɪf edʒ] 美 [ˈnaɪf edʒ]
刀刃的边缘或者是非常尖锐的边缘；在物理学中，用于测量光线的聚焦和散焦的实验仪器
the sharp cutting side of the blade of a knife
同义词： cutting edge
插刀式砌口
刀口
直尺
次日越军占领824高地时，5名士兵已死亡，他们身上的 刀口 ( knife edge )不是站立时拼刺刀(bayonet)的痕迹，而是倒下被刺的刀痕。
... kite 风筝型 knife edge 刀棱 knots 木纹瑕疵 ...
... kink marks 折痕 knife edge 插刀式砌口 knife edge mask 插刀式边沿遮板，亦称 ...
...se)电极，电极借由厚约数十μm的钼箔(molybdenum)与外部的导棒连接，钼箔的线膨胀系数比锰大一位数，因此点灯时刀锋(knife edge)断面状的钼箔产生塑性变形，使得发光管内的超高压能保持一定的气密性，除此之外发光管内除了水银与氩气(argon)，还添加微量的卤素...
Half a mile away there's another thumping great bronze, the two-section 1962 Knife Edge, opposite the House of Lords - a site chosen by Moore for its high visibility.
半英里之外还有另外一件庞大的青铜雕塑，1962年的两片《刀锋》，位于英国上议院对面——因为位置醒目摩尔选择了这里。
The economy is balanced on a knife-edge.
经济形势尚不明朗。
Tonight's knife-edge vote could be uncomfortably close.
今晚的投票难以预料，结果可能会很接近，真令人紧张。
The country is still on a knife edge, possibly slightly blunter but a fall on either side is nonetheless deadly.
CNN: Behind the Scenes: Surge helping, but Iraq still on knife's edge
With counting under way in the north, the party's ambitions are on a knife edge after a dramatic night of results.
Knife Edge Two Piece on Abingdon Street Gardens was gifted in 1967, but no plans were made for its future care.