phase front

• 相前,波阵面

phase front的用法和样例：

例句

1. The characteristic surface is essentially an acceleration front.
   特征曲面实质上是一种加速度波的波阵面。
2. It starts with zero and grows to a maximum slightly behind the wave front.
   它从零值开始，并在稍后于波阵面处增长到最大值。