rate of phase change

• 换相速度

rate of phase change的用法和样例：

例句

1. Each small peak in the carrier would travel to the right with the usual phase velocity.
   载波中的每个小峰都以通常的同相速度向右方运动。
2. The phase velocity dispersion and the numerical phase velocity errors ofelastic wave staggered-grid high-order difference method in anisotropic medium havebeen studied.
   研究了各向异性介质中弹性波动方程交错网格高阶差分法求解的数值相速度色散和数值相速度误差。