acoustic frequency branch

例句：

1. 1. The acoustical branch of the physics department has been undergoing a major reorganization.
   物理系的声学分支正在进行重大重组。
2. 2. The acoustic branch is responsible for studying the propagation of sound waves through materials.
   声学分支负责研究声音波通过材料的传播。
3. 3. The acoustic branch is also involved in developing new technologies for improving hearing aids.
   声学分支还参与开发新技术，以改善助听器的性能。