形容詞 instrumental:

1. relating to or designed for or performed on musical instruments
2. serving or acting as a means or aid
   同義詞：implemental, subservient

1. I like instrumental music better than vocal music.
   我喜歡器樂勝于聲樂。
2. Our artistic director was instrumental in persuading the orchestra to come.
   我們的藝術指導幫助請來管弦樂隊。
3. His instrumental works are popular amongst the students.
   他的器樂曲在學生中很受歡迎。
4. I was instrumental in catching the criminal.
   我曾經協助捉拿這罪犯。

in.stru.men.tal

adj.（形容詞）
Serving as a means or an agency; implemental:
作為手段的；作為中介的；有幫助的：
例句：
was instrumental in solving the crime.
有助于解決犯罪問題

Of, relating to, or accomplished with an instrument or a tool.
儀器或工具的，與之相關的或用其完成的
Music Performed on or written for an instrument.
【音樂】 用樂器演奏的或為樂器譜寫的
Grammar Of or designating a case used typically to express means, agency, or accompaniment.
【語法】 工具格的：代表性的用來表示方式，中介或伴隨格的，或指示此格的
Of or relating to instrumentalism.
工具格的，工具詞的
n.（名詞）

Grammar The instrumental case.
【語法】 工具格
A word in the instrumental case.
工具格中的一個詞
Music A composition for one or more instruments, usually without vocal accompaniment.
【音樂】 器樂曲：為一種或多種樂器所寫的曲子，通常是沒有伴聲的

【引伸】
in.strumen.tally
adv.（副詞）