first order

US /fɚst ˈɔrdɚ/

UK /fə:st ˈɔ:də/

A1 初級
n.名詞首要任務
The safety of the passengers is always the first order of business.
adj.形容詞一階
This is a first order differential equation.
n.名詞首次訂購
We need to fulfill all first orders before taking new orders.

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