acoustic
/əˈku:stɪk; ə`kustɪk/ adj
1
(a) of sound or the sense of hearing 声音的; 听觉的.
(b) of acoustics 1 传音效果的; 声学的.
2 [usu attrib 通常作定语]
(of a musical instrument) not electric （指乐器）原声的（不是电的）
an acoustic guitar 原声吉他. =>illus at App 1 见附录1之插图, page xi. acoustic, n [sing]
= acoustics 1
The hall has a fine acoustic. 这个大厅的传音效果很好.