We can play a very controlled, designed sound to the animal, a hearing test tone.

“我们会给白鲸播放严格控制且精心设计的听力测试音。

The " stops" are what controls the sound – the loudness of the sound in part.

“停止”是控制声音的因素——部分是声音的响度。

By this time Patsy's voice had already become something special. She had learned to control not only the sound but the feelings expressed in her songs.

到这时，佩茜的嗓音已经变得有些特别。她学会了控制声音和各种传达出的情感。

They have a lot of technical problems – specifically, problems with the machines that control the sound.

他们有很多技术问题——特别是控制声音的机器问题。