acoustic approximation

例句：

1. 1. The acoustical approximation of the sound wave is usedto determine its frequency.
   声波的声学近似用于确定其频率。
2. 2. Acousticalapproximations are often used in engineering tomodel complex systems.
   声学近似在工程中常被用来模拟复杂的系统。
3. 3. Acoustical approximations can be used to improvethe accuracy of measurements made by microphones.
   声学近似可以用来提高麦克风测量的准确性。