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doubtful

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I was doubtful about what they have said, but I didn't say anything.(我对他们说的话感到很怀疑，但我也没说什么。)
It is doubtful whether Ted, even with his fluent French, passed for one of the locals.(让人存疑的是特德——即使法语说得很流利——能否被人当作一名当地人。)
It's doubtful that a computer program can do that—at least, not without some undesirable results.(计算机程序能否做到这一点是存在疑问的，至少，它一定会带来一些人们不想要的结果。)
Most biologists, nonetheless, are doubtful that this is a humanlike adolescent growth spurt.(尽管如此，大多数生物学家还是怀疑这是否是一种类似人类的青春期突增。)
We were doubtful about the practicability of the plan.(我们怀疑这个计划是否切实可行。)
I was still very doubtful about the chances for success.(我仍然不能肯定成功的可能性有多大。)
It's doubtful if this painting is a Picasso.(这未必就是毕加索的画。)
The research lacks solid evidence, and therefore, its conclusions are doubtful.(这项研究缺乏确凿的证据，因此，其结论值得怀疑。)
He was doubtful about accepting extra work.(他拿不定主意是否接受额外工作。)
It's doubtful whether there'll be any seats left.(看来未必还有座位。)

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