1.challenge作名词，比较好掌握：挑战、艰巨的任务
an exciting/interesting challenge
令人激动的 / 令人感兴趣的挑战
face a challenge面临挑战
present a challenge带来挑战
accept a challenge/take up a challenge接受挑战
mount a challenge 发起挑战
South Africa’s ruling National Party has beaten off a right-wing challenge.
南非执政的国民党已经击退了右翼分子的一次挑战。
He refused to take up the challenge that was offered.
他不愿意迎接别人向他提出的挑战。
legal challenge上诉
The role will be the biggest challenge of his acting career.
扮演这个角色将是他演艺生涯中最大的挑战。
Destruction of the environment is one of the most serious challenges we face.
环境的破坏是我们所面临的最严峻的挑战之一。
Schools must meet the challenge of new technology .
学校必须迎接新技术的挑战。
His challenge to Mrs Thatcher brought her down.
他的挑战导致了撒切尔夫人的下台。
She looked at me with challenge.
她带着挑战的目光看着我。
The world community should not flinch in the face of this challenge
国际社会在面对这一挑战时不应该回避。
The chairwoman is up against the greatest challenge to her position.
女主席正面临职位上的最大挑战。
It is a wonderful challenge and we should always accept a challenge.
这是一个伟大的挑战，我们乐于接受这项挑战。
Are you ready when we face the challenge from the reality?
面对来自现实的挑战，你准备好了吗？
beyond challenge
无以伦比；无与伦比；无可非议
The force one seed could performs is beyond challenge at all. Here’s another story.
一粒种子可以显现出来的力，简直是超越一切，这儿又是一个故事。
2.动词：挑战，怀疑，质询，质疑，强烈建议，考查能力，盘问
Challenge sb to sth/to do sth向某人挑战
Mike challenged me to a game of chess.
迈克硬逼着要和我下一盘棋。
The opposition leader challenged the prime minister to call an election.
反对党领袖要求首相宣布进行大选。
A mum slashed a neighbour’s car tyre and challenged her to a fight after their daughters fell out.
两家的女儿吵起来后，一个妈妈划破了邻居的车胎，说要和她较量较量。
The post will give him a powerful political base from which to challenge the Kremlin
这个职位将给他提供一个强有力的政治基点来挑战克里姆林宫。
Democratic leaders have challenged the president to sign the bill
民主党领袖对总统签署这项法案提出了质疑。
He left a note at the scene of the crime, challenging detectives to catch him
他在犯罪现场留了个条儿，向警探挑衅。
3.动词：引起，激起，要求
Challenge one’s interest引起某人的兴趣
Challenge one’s attention引起某人的注意
Challenger 挑战者