断言;

Behind them was a confusion of noise, perhaps even a shot, but he couldn't swear to it.
他们身后响起一片嘈杂声,也许还有枪击声,但他不能确定。
来源:《柯林斯高阶英汉双解学习词典》Swear to me on your honour that this story of yours is based on legal fact.
你得发誓刚才你说的那一套都是根据法律的.
来源:词典精选例句If he had been recently hurt, he would weep bitterly and swear to run away.
如果他刚遭到毒打, 他会痛哭一场,赌神罚咒地逃跑.
来源:词典精选例句
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