難題的英文：
a difficult problem; an arduous problem; a tough question

difficult是什么意思：
adj. 困難的；執(zhí)拗的；不易相處的
  • The exercise is that difficult!
    練習題那么難！
  • You must admit the task to be difficult [ that the task is difficult ].
    你應當承認這項任務是艱巨的。
  • You must admit the task to be difficult [that the task is difficult].
    你必須承認這項任務是困難的。
problem是什么意思：
n. 難題，困難；邏輯題
  • It was a complex problem.
    這是一個復雜的問題。
  • Is the problem that easy?
    問題有那么簡單嗎?
  • This is a prime problem.
    這是一個有關(guān)質(zhì)數(shù)的問題。
arduous是什么意思：
adj. 費力的，辛勤的，險峻的
  • Success is the fruit of arduous striving.
    成功是奮斗的結(jié)果。
  • They are very glad that they have been assigned the most arduous task .
    他們很高興被派給最艱巨的任務。
  • His timidity disinclined him from such an arduous enterprise
    他的怯懦使他不愿從事一項如此艱巨的事業(yè)。

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