1, convice of 使确信
2,inner conviction内心确信
3, be confident of success确信能够成功
4, It must be非常肯定
5,So Sure如此确信,无疑
6,be sure of 确信 ,无疑
7,sth. to be true确信无疑
拓展例句:
1,As long as we try our best, we are undoubtedly the bravest and most commendable people.
只要我们用尽了全力,我们无疑就是最勇敢最值得表扬的人。
2,She must be innocent, which I am sure.
她一定是清白的,这一点我确信无疑。
3,This must be the most amazing thing.
这无疑是最令人惊喜的事情。