名词
中文翻译：核心阶段
同义词：
['core period', 'core stage']
例句：
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1.The project is in the core phase of development.
该项目正处于发展阶段的核心阶段。
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2.During the core phase, the team worked tirelessly to achieve its goals.
在核心阶段，团队努力工作以实现其目标。
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3.The company is currently in the core phase of its expansion plan.
该公司目前正处于其扩张计划的核心阶段。