怀疑,疑虑( doubt的名词复数 );未确定;
怀疑,疑惑( doubt的第三人称单数 );

这两者的区别仅在于前者较随便,后者较正式。
这两个词共同的意思是“怀疑”。它们的区别是:
1.两者都可以接that从句作宾语,但含义不同:前者的意思是“疑为非”; 后者的意思是“疑为是”。试比较:
I doubt that she is the criminal.
我不相信她是罪犯。(认为不见得)
I suspect that she is the criminal.
我怀疑她是罪犯。(认为有可能)
2.doubt后可接whether或if从句,但suspect则不能。
这两个短语意思相近,但仍有区别。前者一般表示某人对某事拿不准或某事尚不能确定,其主语可以是人,也可以是事; 而后者一般指客观事物,表示事态难以预料,悬而未决,在语气上不肯定的程度更浓,给人以危机感,其主语一般为事〔物〕。例如:
The result of the experiment is still in doubt.实验结果尚未确定。
He was sent to the hospital, but his life hangs in doubt.他被送往医院了,但死活难以预料。
I had my doubts when she started, but she's getting really good.
她刚开始做时我心存疑虑,但她真的做得很好。
来源:《柯林斯高阶英汉双解学习词典》I have grave doubts that the documents tell the whole story.
我对这些文件能否说明所有的问题深表怀疑。
来源:《柯林斯高阶英汉双解学习词典》Many Lithuanians have expressed doubts about the wisdom of the decision.
很多立陶宛人对该决定是否明智表示了怀疑。
来源:《柯林斯高阶英汉双解学习词典》The research showed beyond doubt that smoking contributes to heart disease.
这项研究确实表明吸烟会导致心脏疾病。
来源:《牛津高阶英汉双解词典》Whether he will continue to be successful in future is open to doubt.
他今后能否继续获得成功值得怀疑。
来源:《牛津高阶英汉双解词典》Many technical experts at the time had doubts about the technology.
当时,许多技术专家对那种工艺抱有疑问。
来源:《柯林斯高阶英汉双解学习词典》I have doubts about the advisability of surgery in this case.
关于该病例做手术的可行性,我持有疑问。
来源:《柯林斯高阶英汉双解学习词典》When he heard these words, Shinran felt his inner doubts melt away.
听到这番话,欣兰感到他内心的疑虑顿时消散了。
来源:《柯林斯高阶英汉双解学习词典》Despite his constant protes-tations of devotion and love, her doubts persisted.
尽管他一直宣称对她的爱忠贞不渝,她仍然心存怀疑。
来源:《柯林斯高阶英汉双解学习词典》Whatever doubts he might have had about Ingrid were all over now.
他对英格丽德可能存有的疑虑现在全都烟消云散了。
来源:《柯林斯高阶英汉双解学习词典》Malcolm works in isolation but I have no doubts about his abilities.
马尔科姆单打独干,但我对他的能力丝毫不怀疑。
来源:《柯林斯高阶英汉双解学习词典》The article raised doubts about how effective the new drug really was.
这篇文章对这种新药的实效有多大提出了疑问。
来源:《牛津高阶英汉双解词典》There are still doubts about the final signing of the two treaties.
仍然有人怀疑这两份条约最终能否签署。
来源:《柯林斯高阶英汉双解学习词典》
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