difficult

• Collecting bad debts is often a difficult affair .
  收呆帐往往是件棘手的事。
• Sunday is a difficult day for tom .
  星期天是汤姆难过的日子。
• She was sent abroad on a difficult assignment .
  她被派出国执行一项艰巨任务。
• The interferometer is relatively difficult to align .
  这种干涉仪比较难调整。
• It is difficult to breathe at these altitudes .
  在这些高的地方呼吸感到困难。
• It simply made things more difficult .
  这只会使事情更难办。
• A difficult problem or two occupied his mind .
  有一两个困难问题在他心里回旋。
• It was difficult to gauge how people would respond .
  大家的反应如何难以估计。
• It was difficult not to be tempted .
  对此不动心是很困难的。
• It is very difficult to describe my joy in words .
  我的快乐难以用语言来形容。