挑战 + (了) + Object
挑战 (tiǎozhàn) means 'to challenge' as a verb or 'challenge' as a noun. It is used when someone confronts a difficult task or opponent. For example, 挑战了 with the particle 了 indicates that the challenge has been carried out.
他决定挑战自己,去跑马拉松。
tā juédìng tiǎozhàn zìjǐ, qù pǎo mǎlāsōng.
He decided to challenge himself and run a marathon.
这个项目对我们来说是一个很大的挑战。
zhège xiàngmù duì wǒmen lái shuō shì yī gè hěn dà de tiǎozhàn.
This project is a big challenge for us.
她成功挑战了世界纪录。
tā chénggōng tiǎozhàn le shìjiè jìlù.
She successfully broke the world record.