I firmly believe that my experience is adequate to take up this job.

我坚信我的经验足够让我从事这份工作。

I firmly believe children should be taught to cooperate rather than to compete.

我坚信应该教育孩子们学会合作而不是互相竞争。

For one thing, I firmly believe that reading can increase our knowledge. For another, reading helps us to calm down when we feel upset.

首先，我坚信阅读能增加我们的知识。另一方面，当我们感到沮丧时，阅读帮助我们平静下来。

Some students firmly believe that studying overseas enables them to be independent, and they will try their best to adapt to a new life.

一些学生坚信留学能使他们独立，并尽最大努力适应新的生活。

We firmly believe that our just cause will succeed.

我们坚信我们的正义事业必定胜利。