形容词
中文翻译：首要的
同义词：
['primordial', 'primary', 'primal']
例句：
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1.The primary function of this machine is to cut paper.
这台机器的主要功能是切割纸张。
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2. The primary cause of the fire was a short circuit in the wiring.
火灾的主要原因是电线短路。
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3. The primary goal of the project is to improve public transportation.
该项目的首要目标是改善公共交通。