I am dubious about what he has done.

我对他所做的事半信半疑。

Tom was arrested by the police for his dubious track.

由于汤姆可疑的行踪，他被警察逮捕了。

I certainly wouldn't put my money on something dubious.

我肯定不会把钱投在没有把握的事情上。

I'm dubious about his promises to change his ways.

他承诺将改变行事方式 我对此有些怀疑

She made her living from mesmerism, offering dubious treatments at an exorbitant price.

她靠催眠为生，价格过高却疗效未知。

They indulged in some highly dubious business practices to obtain their current position in the market.

他们采取了一些极为可疑的商业手段以取得目前在市场上的地位。

The testimony given by him is dubious.

他所作的证据是可疑的。

I was rather dubious about the whole idea.

我对这整个想法持怀疑态度。

This claim seems to us to be rather dubious.

这项声明在我们看来相当不可信。

They consider the plan to be of dubious benefit to most families.

他们认为这项计划对大多数家庭不一定有好处。