形容词
中文翻译：Unknown
同义词：
['primary', 'fundamental']
例句：
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1.The principal's office is located in the center of the school.
校长办公室位于学校中心。
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2. The primary goal of this project is to improve efficiency.
这个项目的主要目标是提高效率。
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3.The fundamental principle of democracy is the rule of law.
民主的基本原则是法治。