You might feel doubtful to my words, but you cannot deny it that in an unbound space and time the things that cannot be imaged could definitely not happen.

这时你就只有半信半疑地听我吹牛，因为你不能否认在无限时空里，这个超越想象的可能实在，在未来一定不会发生。

youdao

It is not Dragon's Den, but it is doubtful that responsible charitable trusts or institutional investors will be committing wads of cash to a payment-by-results mentoring scheme for ex-offenders without good evidence that it can get those results.

BBC: A popular idea still on probation