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 to be quite a …

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 可怕 的 挑战。

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

Definition of challenge noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

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

Jun 21, 2025 · The term "challenge" refers to a difficult task, an invitation to compete, a question of validity, or a stimulating test of one's abilities. Understanding and embracing "challenge" enables …

CHALLENGE definition: 1. (the situation of being faced with) something that needs great mental or physical effort in…. Learn more.

Synonyms for CHALLENGE: objection, exception, question, complaint, protest, difficulty, criticism, fuss; Antonyms of CHALLENGE: willingness, approval, sanction, agreement, acceptance, compliance, …

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 to be quite a …

Jan 4, 2026 · Welcome to the Brain Health Challenge! I’m Dana Smith, a reporter at The New York Times, and I’ll be your guide. To live a healthy life, it’s crucial to have a healthy brain. In the short ...