形容词
中文翻译：主要的
同义词：
['first', 'primary']
例句：
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1.The primary goal of the project is to improve efficiency.
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.
他成功的首要原因是他的勤奋工作。
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3. The primary function of this machine is to sort items.
这台机器的主要功能是排序物品。