您要查找的是不是：
- The defining challenge of the 21st century will be to face the reality that humanity shares a common fate on a crowded planet. 21世纪明确的挑战将面对这样一个现实：在一个拥挤的星球上，人类分享一个共同的命运。
- "I don't think I have to emphasise that climate change is one of the defining challenges of our time. “我认为，我不必强调气候变化是我们时代最典型的挑战之一。
- Are you going to take the challenge lying down? 你打算屈服于这种挑战吗？
- Never challenge a fool to do wrong. 不要怂恿愚人干错事。
- I perceived his comment as a challenge. 我认为他的批评是对我的激励。
- I felt a perverse desire to accept his challenge. 他向我挑战，我就偏要应战。
- He received a challenge to a TV debate. 他接到电视辩论的挑战。
- He wants a career that offers a challenge. 他要有挑战性,能有一番作为的事业。
- Open to doubt or challenge; problematic. 可疑的易于受到怀疑或挑战的; 有疑问的
- What did he do in reply to your challenge? 你提出与他较量，他作何反应?
- A lot will depend on how she responds to the challenge. 在很大程度上将取决於她对这一难题的反应。
- defining challenge 特有的挑战
- Nowadays no one will challenge the fact that the earth is round. 现在没有人会对地球是圆的这一事实提出异议。
- The time was ripe for a challenge to the power of the government. 时机已经成熟，可以向政府权力提出挑战了。
- I was met with a challenge when approaching the post. 我在走近哨所时被查问身分。
- The crossing of this dangerous river was a challenge to most of us. 对我们大多数人来说,横渡这条充满危险的大河确实是个挑战。
- They could be expected to rise to the challenge of risk. 可以指望他们会奋起应付危险局面。
- This is the most serious challenge from his political foe. 这是来自他政敌的最严重的挑战。
- Defining software engineering - again! 再一次,定义软件工程学!
- To build a road in the mountainous area was a real challenge. 在山区修筑公路确是艰钜的事。
