acoustic

1. ADJ An acoustic guitar or other instrument is one whose sound is produced without any electrical equipment. 自然声的[ADJ n]

2. N-COUNT If you refer to the acoustics of a space, you are referring to the structural features which determine how well you can hear music or speech in it. 传声效果

In this performance, Rattle had the acoustics of the Symphony Hall on his side. 在这场演出中，拉特尔有着交响音乐厅传声效果的翼助。

3. N-UNCOUNT Acoustics is the scientific study of sound. 声学

...his work in acoustics. …他在声学方面的工作。