acoustic

1. ADJ An acoustic guitar or other instrument is one whose sound is produced without any electrical equipment. 自然聲的[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. 傳聲效果

In this performance, Rattle had the acoustics of the Symphony Hall on his side. 在這場演出中，拉特爾有著交響音樂廳傳聲效果的翼助。

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

...his work in acoustics. …他在聲學方面的工作。