名词
中文翻译：Unknown
同义词：
['Oath', 'vow', 'pledge']
例句：
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1. The diplomats exchanged oaths of loyalty to their respective countries.
外交官们交换了对各自国家的忠诚誓言。
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2. The couple took a vow of never to leave each other.
这对夫妇发誓永不离开对方。
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3. She made a pledge to help the needy.
她发誓要帮助需要帮助的人。