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1.He needs a navigation certificate to sail in the open sea.
他需要一张航海证书才能在公海上航行。
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2.The captain requested a navigation certificate for his new vessel.
船长要求为他的新船颁发一张导航证书。
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3. The pilot needed a navigation certificate to cross the river safely.
飞行员需要一张导航证书才能安全地过河。