名词
中文翻译：外交函件
同义词：
['diplomatic correspondence', 'diplomatic letter']
例句：
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1. The diplomats exchanged notes on the latest developments in the region.
外交官们交换了关于该地区最新发展的笔记。
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2. He sent a diplomatic note to express his regret over the delay in the project.
他发送了一份外交信函，表示对项目延期的遗憾。
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3. The diplomatic note was carefully reviewed by the government officials before it was released.
这份外交信函在政府官员审查后才得以发布。