名词
中文翻译：第一顺序
同义词：
['primary', 'primary order', 'first-order priority']
例句：
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1. Thefirst order of business is to set a meeting agenda.
首要任务是制定会议议程。
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2.In the first order of things, we need to ensure food security.
在首要事项中，我们需要确保食品安全。
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3. The company's first order of business was to restructure its operations.
该公司的首要任务是重组其运营。