词典释义：
a feeling of uncertainty or lack of conviction
不确定，疑惑，怀疑，疑虑
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some doubt has been cast upon the authenticity of this account 人们对这一报道的真实性产生了某种怀疑
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[count noun]
they had doubts that they would ever win .他们对自己能否获胜曾产生过怀疑。
[with obj.]feel uncertain about
不能肯定，对…没准儿
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I doubt my ability to do the job .我对自己是否有能力做这工作没有把握。
question the truth or fact of (something)
怀疑，对…有疑问
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who can doubt the value and necessity of these services? 谁能怀疑这些服务的价值和必要性？
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[with clause]
I doubt if anyone slept that night .我怀疑那天夜里是否有人睡过觉。
disbelieve (a person or their word)
不相信
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I have no reason to doubt him .我没有理由不相信他。
[no obj.]feel uncertain, especially about one's religious beliefs
（尤指对自己的宗教信仰）不肯定；怀疑。
[with clause]
〈英，古〉 害怕；恐怕；担心
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I doubt not any ones contradicting this. 我不担心有人反对这一点。
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beyond doubt allowing no uncertainty 无疑地，确实地you've proved it beyond doubt . 毫无疑问，你已证明了它 -
in doubt open to question 可怀疑的，存在疑问的the outcome is no longer in doubt . 结果已毋庸置疑 -
feeling uncertain about something 不能肯定的，不确定的
by the age of 14 he was in no doubt about his career aims . 他14岁时就确定了奋斗目标 -
no doubt used to indicate the speaker's firm belief that something is true even if evidence is not given or available 无疑地，确实地，我确信those who left were attracted, no doubt, by higher pay . 毫无疑问，那些离去的人是受了高薪的吸引 -
used to introduce a concession which is subsequently dismissed as unimportant or irrelevant 很可能，或许
they no doubt did what they could to help her, but their best proved insufficient . 他们或许尽力帮助了她，但还不够，他们没有全力以赴 -
without （a） doubt indisputably 毋庸置疑地he was without doubt the very worst kind of reporter . 毋庸置疑，他属于那种最糟糕的记者
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no doubt 无疑；很可能
真题例句：
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there is no doubt that ... 毫无疑问...；无疑地
真题例句：
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without (a) doubt 毋庸置疑地
真题例句：
"Middle English： from Old French
