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。
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》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》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》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》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》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》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》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》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》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》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 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》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》微语录 · 个性签名
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