If they can't compare it to anything, it's doubtful that they will be able to see how your offering could work.
如果他们不能将你的产品和其他产品做任何比较，他们就很难明白你所提供的服务能逃起到什么样的作用。
It is even doubtful that those jobs will be saved, as cheap tires can be obtained from other places like Mexico instead.
我们甚至可以怀疑究竟这些工作岗位能否被挽救下来，因为便宜的轮胎也能从其他地方比如墨西哥进口。
But it is doubtful that the economics of online or mobile video will ever be as attractive as the economics of traditional television.
但人们怀疑因特网和手机视频经济不会永远像传统电视经济那样有吸引力。
Moreover, while many analysts are doubtful that the anti-militant campaign will be decisively won, it will certainly be extremely costly.
其次，尽管许多分析人士怀疑这场战斗能否取得决定性胜利，但毋庸置疑的是这很花钱。
But lest we forget, in the annals of history, it is doubtful that the past 100 years will be remembered for their contribution to age-old art forms such as painting or sculpture.
但是，我们不能忘记历史的史册，我们不应该怀疑过去的100年里那些被铭记的古老的绘画或雕塑等艺术形式。
But lest we forget, in the annals of history, it is doubtful that the past 100 years will be remembered for their contribution to age-old art forms such as painting or sculpture.
但是，我们不能忘记历史的史册，我们不应该怀疑过去的100年里那些被铭记的古老的绘画或雕塑等艺术形式。
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