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》

In the car she reverted to the subject uppermost in her mind. "You know, I really believe what Grandma told you."

在车里她又提起了她头脑里最重要的话题：“你知道，我确实相信奶奶告诉你的那些事。”

《柯林斯英汉双解大词典》

I really believe the core idea of making is to have an idea within your head—or you just borrow it from someone—and begin to develop it, repeat it and improve it.

我的确认为，制作的核心理念是在你的头脑中有形成一个想法，或者从别人那里借鉴一个想法，然后开始开发、重复并改进它。

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 really believe in good exercise. That's why I like to walk all the time.

我也相信锻炼对人有好处。那就是我总喜欢散步的原因。

在中央公园溜达 - SpeakingMax英语口语达人

So I can't use thinking about the Williams cases as a method of deciding what do I really believe, the body view or the personality view?

因此我不能采用Williams的案例,来帮助我们判断我们应该相信哪种理论，肉体理论还是人格理论？

耶鲁公开课 - 死亡课程节选

"I really believe this is going to be life-changing for my son, " she says.

WSJ: New Muscular Dystrophy Drugs Offer Hope

I'm a novice manager in terms of games but I really believe this is my time.

BBC: Manager Rafael Benitez vows to fight on at Liverpool

"I really believe in the power of sport for changing people, " Gould said.

WSJ: Ref's death a consequence of lack of sportsmanship