形容词
中文翻译：主要的
同义词：
['first', 'primary', 'chief例句：1. The primary goal of the project is to reduce pollution.（该项目的首要目标是减少污染。）']
例句：
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1. The primary goal of the project is to reduce pollution.
该项目的首要目标是减少污染。
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2.The primary reason for his absence was a family emergency.
他缺席的主要原因是一个家庭紧急情况。
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3.The primary function of this tool is to measure distances.
这个工具的主要功能是测量距离。