难题的英文：
difficult problem

参考例句：
  • The famous mathematician is brainiac who would rather work on solving complex mathematical problems than sleep at night.
    这位著名数学家十分聪明和勤奋，宁愿晚上不睡觉，也要解开复杂的数学难题。
  • explain puzzles
    解释难题
  • A tangled skein of problems
    盘根错节的一堆难题
  • A tough game,assignment,problem,journey
    艰苦的比赛、困难的任务、难题、艰辛的旅程.
  • luckily, the answer to this puzzle is very simple
    幸亏这个难题的解答倒十分简单。
  • In ethics, there is a poser about the difference between killing and letting die.
    就道德而论，任其死亡是否有异于杀害是一个难题。
  • Bill always has a card up one's sleeve, so whenever faced up with a puzzle, he could find a way.
    比尔总有锦囊妙计，所以任何时候遇到难题，他总能找到方法解决。
  • I've just had a brainwave; I know a new approach to the difficult problem!
    我刚才灵机一动,突然想出了一个解决这一难题的新办法!
  • Do a puzzle
    解决难题
  • The complexities of higher mathematics
    高等数学的难题.
difficult是什么意思：
adj. 困难的；执拗的；不易相处的
  • The exercise is that difficult!
    练习题那么难！
  • You must admit the task to be difficult [ that the task is difficult ].
    你应当承认这项任务是艰巨的。
  • You must admit the task to be difficult [that the task is difficult].
    你必须承认这项任务是困难的。
  • This is as difficult a problem as you are likely to meet.
    像这样的难题，你可能会碰到。
  • Russian is a difficult language to master.
    俄语是门难以精通的语言。
problem是什么意思：
n. 难题，困难；逻辑题
  • It was a complex problem.
    这是一个复杂的问题。
  • Is the problem that easy?
    问题有那么简单吗?
  • This is a prime problem.
    这是一个有关质数的问题。
  • These are the resolved problems.
    这些是已经解决的问题。
  • The housing problem is bound up with the problem of gale controls.
    住屋问题涉及租金控制问题。

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