improvement
definitions
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noun
The action or process of making or becoming better; a change for the better.zh: 改进;改善
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noun
A thing that makes something better; an upgrade or enhancement.zh: 改进之物;升级
examples
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There has been a marked improvement in his health.
他的健康状况明显改善。
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The new software is a major improvement over the old one.
新软件是对旧软件的重大改进。