名词
中文翻译：四阶段
同义词：
['multi-stage', 'multi-phase', 'four-fold', 'fourfold']
例句：
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1. The project is divided into four stages of development.
该项目分为四个发展阶段。
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2.The company has implemented a four-stage training program for its employees.
该公司为员工实施了一个四级培训计划。
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3. The research was divided into four stages of analysis.
研究被分为四个分析阶段。