rate of phase change的用法和樣例：
例句
- Each small peak in the carrier would travel to the right with the usual phase velocity.
載波中的每個小峰都以通常的同相速度向右方運動。 - The phase velocity dispersion and the numerical phase velocity errors ofelastic wave staggered-grid high-order difference method in anisotropic medium havebeen studied.
研究了各向異性介質中彈性波動方程交錯網格高階差分法求解的數值相速度色散和數值相速度誤差。
