疑案的英文：
doubtful case

参考例句：
  • Everybody put forward his opinion on the disputed case.
    大家都对这个疑案提出自己的见解。
  • "Quite accidentally, the police tumbled on the answer to the mystery."
    警察出乎意外地找到了那疑案的答案。
  • The detective believes the missing gun is the key to the mystery.
    那侦探认为那把丢失的枪是侦破这宗疑案的线索。
  • Owing to the continual absence of all clue to the mystery, the popular excitement greatly increased
    由于这件疑案一直找不到什么线索，人心也就越来越骚动了。
doubtful是什么意思：
adj. 可疑的，不确定的
  • benefit of the doubt
    裁判员对可疑情况无把握时不对有关运动员作不利判定
  • They were beset by doubts and fears .
    他们被疑虑和恐惧所困扰。
  • Being such as to debar questioning or doubts.
    无异议的如此以至使质疑或怀疑都没有必要的。
  • They have never doubted of success.
    他们对成功从未怀疑过。
  • Doubt is the key of knowledge
    怀疑乃知识的钥匙

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