形容词
中文翻译：主要的
同义词：
['primary', 'chief', 'foremost例句：1. The primary goal of the project is to improve efficiency.（该项目的首要目标是提高效率。）']
例句：
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1. The primary goal of the project is to improve efficiency.
该项目的首要目标是提高效率。
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2.The primary reason for his success was his hard work.
他成功的主要原因是他的努力工作。
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3.The primary function of this machine is to clean the floor.
这台机器的主要功能是清洁地板。