形容词
中文翻译：主要的
同义词：
['first-class', 'foremost', 'primary例句：1. The primary goal of this project is to improve efficiency.（这个项目的首要目标是提高效率。）']
例句：
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1. The primary goal of this project is to improve efficiency.
这个项目的首要目标是提高效率。
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2.The primary reason for the delay was a lack of resources.
延误的主要原因是没有资源。
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3. The primary method of transportation in this region is by car.
该地区的主要交通方式是汽车。