1.challenge用作动词的基本意思是“挑战”,指通过决斗或其他较量方式解决争端。引申指对某事的正确性、合法性提出“质疑”; 也可指“考验某人的能力”“激发某人做某事”; 还可指哨兵“喝令站住”,盘问诸如身份、姓名、意图等; 亦指“要求”“需要”。
2.challenge是及物动词,可接名词、代词或从句作宾语,也可接以动词不定式充当补足语的复合宾语。可用于被动结构。

用作及物动词
▲S+～+n./pron.
I did not think he was right, so I challenged him.我认为他是不对的,因此向他提出质疑。
The job doesn't really challenge him.这项工作不能真正地考验他。
When I tried to enter the building, the guard at the door challenged me.我试图进入大楼时,卫兵查问了我。
I challenged him to a game of chess.我要求同他下盘棋。
◇ 用于be ～ed结构
U.S. business today is challenged by aggressive overseas competitors.今天的美国商业受到咄咄逼人的外国竞争者的挑战。
His claim to that piece of property is being challenged.有人就他对那份财产的声明提出异议。
He was busy challenging for the leader of the club.他正忙于竞选争当俱乐部领导人。
▲S+～+wh-clause
He challenged why I didn't get things ready before.他质问我为什么不早点准备。
用作宾补动词
▲S+～+n./pron.+to-v
I challenge you to show your proof.我要求你拿出证据来。
He challenged us to try again.他向我们挑战,要我们再试试。

challenge后接的sb to-v也可认为是双宾语。

［同义词］ n. defiance
［反义词］ v. concede
［词源］＜古法语chalenge(挑战)

1.challenge用作名词的基本意思是“挑战,邀请比赛”。引申可指“具有挑战性的事物”“艰巨的任务”; 也可指对某事的正确性或合法性的“质疑”; 还可指哨兵发出的“止步命令,喝停盘问”。
2.challenge常与介词to连用,引出挑战的对象。
3.challenge可接动词不定式，表示“提出…的挑战”。

Exploring outer space is a challenge to mankind.探索外太空是一项向人类发出的挑战。
I accepted a challenge to a tennis match.我接受了网球赛的挑战。
We should look upon the relative backwardness of our economy as a challenge to greater exertions.我们应该把我国经济的相对落后看成是要求我们做出更大努力的一种鞭策。
A sentry gave the challenge,“Halt!Who goes there?”哨兵喝问:“站住!什么人?”
He sent a challenge to run a race.他发出了赛跑比赛的挑战书。