They have reason to believe that he is lying.

他们有理由认为他是在撒谎。

《牛津词典》

In part because of our military effort, we have reason to believe that progress can be made.

部分由于我们的军事努力，我们有理由相信可以取得进展。

youdao

Scientists have reason to believe that trees do communicate with each other.

科学家们有理由相信树木也可以相互交流。

youdao

Hakimullah Mehsud supposedly called news outlets after rumors of his death first arose, but Pakistani officials say they have reason to believe that it was Mehsud's cousin pretending to be the Taliban leader.

VOA: standard.2009.10.03

Well, Plato's very next argument attempts to persuade us that indeed we do have reason to believe that the soul is one of the prior-existing pieces.

柏拉图下面一个论证就试着,说服我们有理由相信,灵魂原来就是存在的

耶鲁公开课 - 死亡课程节选

The state of nature fully continues, in many ways, oddly even in civil society, he says, whenever we have reason to believe that our lives or our properties or ourselves are not secure.

从很多方面来说，自然状态，即使在文明社会里也显得奇怪，不论我们是否有理由相信我们有生活,生命和财产财产安全的保障。

耶鲁公开课 - 政治哲学导论课程节选

Indeed, we have reason to believe that Saddam's regime is planning to sabotage Iraq's oil fields.

CENTERFORSECURITYPOLICY: Post-War Planning

But, in part because of our military effort, we have reason to believe that progress can be made.

WHITEHOUSE: President Obama Addresses the Nation

We are congenital optimists here and we think we have reason to believe that our optimism is merited.

WHITEHOUSE: Press Briefing