词根 sever= earnest 诚恳 asseverate v. 郑重声明 as 加强 + sever 诚恳 + ate 做 → 一再诚恳表示 → 郑重声明 severe adj. 严肃的；严厉的 sever 诚恳 + e → 态度诚恳 → 严肃的 severity n. 严肃；严厉 severe的名词形式
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1、 I will asseverate my conviction that she is guilty.
我坚持有罪判决，因为她是有罪的。
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2、 He asseverated that he had seen a flying saucer..
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