挑战

挑战

"Challenge."

In this sentence, '挑战' functions as a verb meaning 'to challenge' or 'to question.'

他挑战了传统的观念。

He challenged conventional ideas.

Here, '挑战' again acts as a noun, referring to 'difficulties or obstacles that test one's abilities.'

我们在面对挑战时要勇敢。

We should be brave when facing challenges.

Here, '挑战' is used as a noun meaning 'challenge' or 'an arduous task.'

学习一门新语言是一种挑战。

Learning a new language is a challenge.