形容词
中文翻译：有辅助作用的
同义词：
['auxiliary', 'supplementary']
例句：
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1. The teacher's feedback wasinstrumental in helping the student improve his testscores.
老师的反馈对帮助学生提高考试成绩起了重要作用。
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2. The new policy is instrumental inpromoting environmental sustainability.
新政策有助于促进环境可持续性。
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3. The instrument played an instrumental rolein the success of the project.
该乐器在项目成功中起到了关键作用。