Mr. Perks questioned them at length to establish their bona fides.

珀克斯先生详细地询问他们以确定其诚意。

《柯林斯英汉双解大词典》

His bona fides was questioned.

人家怀疑他的诚意。

youdao

Now that everyone has established their bona fides, should we put our guns away?

现在大家都见过面了，是不是应该把枪放下？

youdao

It has a dramatic history (thanks, Eva Peron), artistic and creative bona fides and city-wide dynamism.

BBC: This is Buenos Aires week

Not surprisingly Nokia is trying to build on this success, by emphasizing its security bona fides.

FORBES: Can Nokia's Lumia Steal RIM's Security Thunder?

Financial bona fides aside, increases to the debt ceiling at such moments are critical.

FORBES: Debt Ceiling: How Can The U.S. Fix This Fiscal Fiasco? Abolish It