I really believe that it is possible to both improve customer satisfaction and reduce costs.

我确实认为既可以提高客户满意度，又可以降低成本。

《柯林斯英汉双解大词典》

I really believe that the devil lies in changes.

我相信变化往往就是噩梦的开始。

youdao

I really believe that it's all still there, and that I'm still there.

我又真的相信那些都还在那儿，我也还在那儿。

youdao

"I honestly believe that you don't really understand what freedom is until you've had that freedom taken away."

VOA: standard.2010.03.25

I don't believe that markets are efficient and it doesn't really seem like it should be an open question.

我不相信市场是有效的,而且事实上这似乎,也不应该是一个开放式的问题。

耶鲁公开课 - 金融市场课程节选

But I know that um, I don't, I'm not superstitious and I don't really believe in luck.

不过，我不是个迷信的人，我并不是真的相信运气。

沉迷于彩票的人们 - SpeakingMax英语口语达人

And in a time of recession, I really believe that people want to sit down and laugh about their lives.

CNN: Multi-camera sitcoms dominate in ratings

"I really believe that God wants to change this city, " he said.

NPR: Southern Baptists Expand North With Church Plants

"I really believe that somebody will come along and play more games because if I can do it, somebody else definitely will, " he said.

BBC: News | Sport | All good things come to an end