solemn asseveration 庄严的断言
categorical asseveration 绝对的声明
strong asseveration 强有力的断言
A: Do you believe his asseveration?
A：你相信他的断言吗？
B: I need more proof before I believe it.
B：在相信它之前我需要更多证据。
1) 断言
2) 郑重声明
1. 断言，肯定
noun
1. A formal or emphatic statement or declaration.
Synonym: assertion, affirmation