reformer
definitions
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noun
a person who seeks to improve or change something, especially a social systemzh: 改革者
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noun
a person who makes changes to a machine or system to make it work betterzh: 改进者
examples
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He was a social reformer.
他是社会改革者。
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The engineer was a tireless reformer.
这位工程师不知疲倦地改进。