I'm rather in doubt about his explanation of this question.

I am sure he will come. I have no doubt about it.

我肯定他会来. 我一点也不怀疑.

There is not much doubt about his guilt.

他有罪几乎是可以确定的.

When in doubt about the meaning of a word, consult a dictionary.

拿不准词义时, 查查词典.

He rose to his feet in a fury to leave no doubt about where he stood on the issue.

他怒不可遏地站起身来，这就清楚地表明了他在这个问题上的态度。

During this trial, there are many doubtable pieces of evidence which must be re-verified.

这次审判中, 有许多证据有质证,需要重新核实.

But even if there was such a sword in Ming dynasty, there's something doubtable.

但即使明代有这种形制、具的剑, 这把剑还是有可疑的地方.

If she had questioned or doubted me, I had been undone.

假使她问我或者怀疑我, 我也就完了.

For all the fury of the storm she doubted his comfort.

她表示怀疑,不管风雪多么狂暴,他也不应该显得这般舒服.

Some of them doubted the feasibility of the proposal.

有些人怀疑这一提议的可行性.

We have never doubted of the success of our experiment.

我们对我们的实验会获得成功从未怀疑过.

Others doubted whether that would happen.

其他人认为那未必会发生。

His justness is not to be doubted.

他的公正毋容置疑.

They inwardly doubted the facts.

他们从心底里怀疑这些事实.

No one doubted his ability, his industry or his integrity.

没人怀疑他的能力、勤奋和正直。

She doubted the naturalness of so large a bill.

她怀疑这么一大笔欠帐是否正常.

He doubted their claim to have forsaken military solutions to the civil war.

他对他们声称已经放弃通过武力解决内战感到怀疑。

They doubted whether all this work would pay off.

他们怀疑这样干是否划得来.

We doubted him a liar.

我们怀疑他是个骗子.

They doubted his speeding up steps.

他们怀疑他是否能加快步伐.

It is doubtful whether Ted, even with his fluent French, passed for one of the locals.

尽管特德能说一口流利的法语，但他是否会被当成当地人仍值得怀疑。