assertion
n
1 [U] action of claiming or stating forcefully; insistence 有力的声言或陈词; 坚持
assertion of one´s authority 对自己权威的维护
an air of self-assertion 坚持己见的姿态
speak with assertion 坚定地说.
2 [C] strong statement claiming the truth of sth (声称某事物属实的)强硬陈词; 断言
I seriously question a number of your assertions. 对你所坚持的说法, 有几点我甚为怀疑.