The challenge is if certain types of people are doing something, it's difficult for other people to break into it, said Po-Shen Loh, the head coach of last year's winning U.S.Math Olympiad team.

An awesome challenge lies ahead of them. Finding a cure for cancer is one of the biggest challenges facing medical researchers. I've promised to finish the task by Friday, but it's going …

The meaning of CHALLENGE is to dispute especially as being unjust, invalid, or outmoded : impugn. How to use challenge in a sentence.

习惯性搭配： was a [complete, total, real] challenge, challenged him to a [duel, competition, game], is [a difficult, an impossible, an insurmountable] challenge, 更多……

something that by its nature or character serves as a call to battle, contest, special effort, etc. Space exploration offers a challenge to humankind

5. The difficulty knowing how much output is lost for good presents a horrible challenge to policymakers. 弄清 楚 有 多少 产出 永久性 丧失 的 难度 很 大， 这 对 决策者 构成 了 一个 可 …

CHALLENGE definition: a call or summons to engage in any contest, as of skill, strength, etc. See examples of challenge used in a sentence.

CHALLENGE meaning: 1 : to say or show that (something) may not be true, correct, or legal dispute; 2 : to question the action or authority of (someone)

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