形容词
中文翻译：主要的
同义词：
['primary', 'primary factor', 'primary importance']
例句：
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1. The primary goalof 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 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 machine is to process materials.
这台机器的主要功能是处理材料。