I agree with it in principle but I doubt if it will happen in practice.

我原则上是同意它的，但我怀疑在实践中它是否会发生。

《柯林斯英汉双解大词典》

I have family and friends who have had swine flu, though I doubt if they appear in the figures.

我有家人和朋友感染了猪流感，尽管我怀疑他们是否出现在数据中。

youdao

I doubt if Kieth totally agreed to those yesses.

我怀疑基思是否完全同意那些看法。

youdao

"I doubt if you can understand how happy this modernizing has made me.

VOA: special.2009.12.07

Now, I doubt if there's anybody here who is indifferent between the choices, indifferent with regard to the choice between these two lives.

我怀疑这里不会有人,会对这两种选择无动于衷，大家对这两种生命选择都会有所感触。

耶鲁公开课 - 死亡课程节选

It was very impactful to start a book that way because I doubt that hardly any readers actually write out a check on the spot to UNICEF; but if you don't, then you are in some sense responsible for the loss of 30 lives.

这是一个有力的开场白,因为我认为几乎不会有读者真的,会写张支票把钱寄给联合国儿童基金会,如果你无动于衷,那么你在某种意义上,要为那逝去的30个生命负责

耶鲁公开课 - 金融市场课程节选

Alas, I doubt if President Obama would nominate Bair or the Senate would confirm her.

FORBES: Sheila Bair For Treasury Secretary

And, quite honestly, I doubt if I would be as remorseful as this young father on his ranch near Shiner.

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No doubt they did get some more business, but I doubt if it is near what they expected or could get.

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