I am convinced that some people complain just to annoy me, for something to do, or they simply enjoy complaining.

我相信有些人抱怨只是为了气我，为了找点事做，或者他们只是喜欢抱怨。

youdao

I am convinced that she is innocent.

我坚信她是清白无辜的。

《牛津词典》

I am convinced that he has learned from his mistakes.

我确信他已经从错误中吸取了教训。

《柯林斯英汉双解大词典》

"I am convinced that Haiti has a remarkable opportunity to escape the chains of its past for several reasons."

VOA: standard.2009.09.09

I am convinced that you cannot study the mind solely by looking at the discipline of psychology.

我坚信,仅仅局限于心理学学科的学习,是不可能让你有能力去研究人类心理的

耶鲁公开课 - 心理学导论课程节选

And when you reread this poem and you look at it in your discussion section, you may want to think about the tenses it sounds tedious but I am convinced that it's not tedious the tenses of the verbs that Milton's using.

当你重新读这首诗,并在讨论时再看它的时候，你可能会思考它的时态,这听起来很乏味，但我确信,弥尔顿用的动词的时态一点都不乏味。

耶鲁公开课 - 弥尔顿课程节选

As much as I am convinced that Blu-ray will win, much of this is based on promises.

ENGADGET: blogger-avatar

But I am convinced that it will be increasingly difficult to shut out the noise.

FORBES: Facebook Everywhere: It Was The OKest Of Times

But secondly I am convinced that these types of tools will be a major influence on how we think.

FORBES: Connect