instrumental

有助益的、起关键作用的常接 in

She was instrumental in getting the new library built.

新图书馆能够兴建，她功不可没。

器乐的、乐器演奏的

The album includes three instrumental tracks with no vocals.

这张专辑收录了三首没有人声的器乐曲。

器乐曲、纯音乐

He usually listens to instrumentals while he studies.

他读书时通常听纯音乐。