knife-edge

n.

刀口，锋利的边缘；

1. The edge of the knife has turned.
   刀口卷刃了。
2. He bought a razor with a keen edge.
   他买了一把刀口锋利的剃刀。
3. He handed me a knife with a keen edge.
   他递给我一把锋利的刀。
4. You must be very careful with this sharp knife.
   你用这把锋利的刀子必须很小心。

knife edge
Finite conductivity uniform GTD versus knife edge diffraction in prediction of propagation path loss
An attenuation function for multiple knife-edge diffraction
Multiple knife-edge diffraction of microwaves
Choice of clip level for beam width measurements using knife-edge techniques
Dimensional restoration of turbine blade knife edge seals
Measurement of a Gaussian laser beam diameter through the direct inversion of knife-edge data
Field emission cathode having an electrically conducting material shaped of a narrow rod or knife edge
Knife-Edge or Plateau: When Do Market Models Tip?
Knife-edge or plateau : when doe market models tip?