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改正， かいせい
1. revision, amendment, alteration
修订、修改、变更
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かいぜん， 改善
1. betterment, improvement
2. kaizen (Japanese business philosophy of continuous improvement)
改善；kaizen，源自日本的持续改进的商业理念
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改革， かいかく
1. reform, reformation, reorganization
改革