He has the dubious distinction of being the first railway baron to go bankrupt.

他担着首位破产铁路大亨名声，这也荣誉吧。

The tests have been shown to be of dubious validity.

这些试验有效性已显得令人怀疑。

He uses some dubious shifts to get money.

他用一些可疑手段去赚钱。

What he said yesterday was dubious.

他昨天说话很含糊。

If his dubious transactions come to the notice of the authorities, he'll get it in the neck.

如果他不诚实交易给当局察觉了, 他就要受到严厉惩罚。

The result is still dubious.

结果尚未定。

He is a dubious character.

他一个靠不住人。

Alex looked dubious, but complied.

亚历克斯看上去有些疑惑，但仍服从了。