They doubted whether all this work would pay off.

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。

Whether the authorities will allow inspection is highly doubtful.

当局是否允许检查还是个大问号。

I am doubtful whether it is true.

我怀疑那是否真实.

This is a doubtful battle.

这是一场胜负难测的战争.

It is doubtful whether he can read my fortune or not.

他能否算出我的运气还是个疑问.

It is doubtful whether our resources will hand out for more than two or three days more.

我们的资源能否再维持两三天以上值得怀疑.

He felt very doubtful of the outcome.

关于结果他感到非常疑惑。

I feel very doubtful about this.

我对这点很怀疑.

They paused at the top of the stairs, doubtful as to which way to go next.

他们在楼梯顶部停住了，不知道接下来该往哪边走。

It is doubtful if dehydrated fruit will make much headway.

脱水水果是否有多大进步尚难予料.

I feel doubtful what I ought to do.

我不知该做什么.

They also seemed of very doubtful value.

它们好像也没有多大价值。

Some British banks have used doubtful property revaluations to improve their capital ratios.

有些英国银行通过使用不可靠的资产重估来提高它们的资本率。

I am very doubtful of that.

我很疑心那件事.

I am doubtful whether I can solve the puzzle, but I'll have a shot at it.

我怀疑能否解决这难题, 我将试试看.

It is doubtful that he will come.

他会不会来值得怀疑.

I'm doubtful where to go.

该往哪里去我心中无底.

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

尽管特威德能说一口流利的法语，他是否能被当作当地人还很难说。