形容词
中文翻译：有作用的
同义词：
['auxiliary', 'supportive', 'contributory']
例句：
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1. The newpolicy is instrumental in improving the efficiency ofour company.
新政策对我们公司提高效率起到了重要作用。
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2. The team's collaboration was instrumentalin achieving the project's success.
团队的合作对项目的成功起到了关键作用。
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3. Theteacher's guidance was instrumental in helpingthe student overcome his difficulties.
老师的指导对学生克服困难起到了重要作用。