形容词
中文翻译：主要的
同义词：
['primary', 'chief', 'primary-grade例句：1. The primary school is located in the city center.（小学位于市中心。）']
例句：
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1. The primary school is located in the city center.
小学位于市中心。
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2.This is a primary-grade textbook for elementary students.
这是一本适合小学生的初级教材。
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3.The primary goal of this project is to improve efficiency.
这个项目的首要目标是提高效率。