动词
中文翻译：改进
同义词：
['improve', 'refine', 'improve upon']
例句：
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1. Thecompany has made significant improvements in its productquality.
该公司在产品质量上取得了显著的改进。
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2. The teacher suggested that we refine ourpresentation techniques.
老师建议我们改进我们的演示技巧。
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3. The new policy aims to improve uponthe existing system.
新政策旨在改进现有系统。