名词
中文翻译：三阶段
同义词：
['threefold', 'three-tiered']
例句：
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1. The projectis divided into three stages for better management.
该项目分为三个阶段以便于更好的管理。
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2.The company has implemented a three-stagetraining program to improve employee skills.
该公司实施了一个三级培训计划来提高员工的技能。
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3.The research was divided into three stages:literature review, data analysis, and conclusion.
研究被分为三个阶段：文献综述、数据分析和结论。