"Have they done the repairs?"—"Can't say off-hand, but I doubt it."

“他们修过了吗？”——“我一时说不清，但我想还没有”。

《柯林斯英汉双解大词典》

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》

Perhaps the charm of the physical book will be lost one day. But I doubt it.

也许有一天纸质图书的魅力将不复存在。但我对此持怀疑态度。

youdao

"It's a little surprising, but I doubt it's going to go very far, mostly because of his age,"

VOA: standard.2009.10.30

It's intuitively clear, but I will just prove it beyond any doubt.

这是很显然的,但是我还是要先证明一下

耶鲁公开课 - 基础物理课程节选

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

Advertising appears to give coherence to this but I doubt it does in reality.

FORBES: Who Has The Winning Innovation Model, Google, Apple, or Samsung?

But I doubt libertarianism will be the course the party takes over the next few years.

BBC: At CPAC, Marco Rubio ducks a challenge

I'm tempted to say he can be lazy, but I doubt that it is that simple.

BBC: Obama victorious, but not yet the master politician