ruler

n.

尺；直尺；统治者；

复数：rulers

1. The ruler is divided into centimetres.
   在尺子上分厘米刻度。
2. He reminded me not to forget to bring my ruler.
   他提醒我别忘了带尺子。

1. The colonists revolted against their British ruler.
   殖民地人民反抗他们的英国统治者。
2. The chairman is only the nominal ruler of the country.
   主席只是那个国家名义上的统治者。

Energy transfer: a spectroscopic ruler.
A molecular ruler based on plasmon coupling of single gold and silver nanoparticles.
Short-Range Spectroscopic Ruler Based on a Single-Molecule Optical Switch
Fluorescence energy transfer as a spectroscopic ruler.
Rule Systems for Run-time Monitoring: from Eagle to RuleR
Polyproline and the "spectroscopic ruler"revisited with single-molecule fluorescence.
Testing the ruler with item response theory: increasing precision of measurement for relationship satisfaction with the Couples Sati...
Probing Dark Energy Using Baryonic Oscillations in the Galaxy Power Spectrum as a Cosmological Ruler
Fluorescence resonance energy transfer spectroscopy is a reliable "ruler"for measuring structural changes in proteins. Dispelling t...
On the Universal Scaling Behavior of the Distance Decay of Plasmon Coupling in Metal Nanoparticle Pairs: A Plasmon Ruler Equation