形容词
中文翻译：主要的
同义词：
['primary', 'fundamental', 'primary source例句：1. The primary function of this machine is to clean the streets.（这台机器的主要功能是清洁街道。）']
例句：
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1. The primary function of this machine is to clean the streets.
这台机器的主要功能是清洁街道。
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2. The primary goal of the project was to reduce waste.
该项目的首要目标是减少废物。
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3. The primary reason for the delay is due to the weather conditions.
延误的主要原因是由于天气条件。