以下为句子列表：
英文: His dual role as a composer and a conductor made him very busy.
中文: 他作曲家和指挥家的双重身份使他非常繁忙。
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英文: Price stability plays a dual role in modern central banking: It is both an end and a means of monetary policy.
中文: 价格稳定在当代中央银行体系中扮演着双重角色：它既是货币政策的目标，又是货币政策的手段。
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