形容词
中文翻译：主要的
同义词：
['primary', 'primary-grade', 'primary-school']
例句：
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1. The primary focus of the project was to improve the efficiency of production.
该项目的主要目标是提高生产效率。
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2. The primary school is located in the heart of the city.
这所小学位于市中心。
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3. Primary research has shown that exercise can reduce stress and improve mental health.
初步研究表明，运动可以减轻压力并改善心理健康。