我挑战你。
wǒ tiǎozhàn nǐ
I challenge you.
她挑战对手。
tā tiǎozhàn duìshǒu
She challenges the opponent.
这是一个挑战。
zhè shì yí gè tiǎozhàn
This is a challenge.
工作很有挑战性。
gōngzuò hěn yǒu tiǎozhànxìng
The job is very challenging.
