ultrasonic wave test的用法和樣例：
例句
- By sweeping a laser along the pipe to change the local wave speed, physicists might be able to create a horizon.
將雷射沿著管路掃過，可以改變局部的波速，運用這種方式，物理學家也許可以創造出視界來。 - The peak of the wave celerity probability distribution appears within the mean velocity region of the two-phase bubbly flow.
空隙率波的波速概率分佈在兩相混合流速處出現峰值，向兩側加速遞減，與高斯分佈接近。
