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I don't know anything about what happened, I swear.
我发誓, 我对所发生的事一无所知。
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They swore an oath to carry out their duties faithfully.
他们宣誓忠实履行自己的职责。
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He swore to obey the king.
他发誓服从国王。
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He swore that he had put the papers in that drawer.
他发誓说, 他是把文件放在那个抽屉里的。