极限

这项工程必须在规定的极限内顺利完成。

zhè xiàng gōng chéng bì xū zài guī dìng de jí xiàn nèi shùn lì wán chéng.

This project must be completed smoothly within the prescribed limits.

这位运动员凭借顽强的毅力，在比赛中不断挑战自己的身体极限。

zhè wèi yùn dòng yuán píng jiè wán qiáng de yì lì, zài bǐ sài zhōng bù duàn tiǎo zhàn zì jǐ de shēn tǐ jí xiàn.

With tenacious perseverance, this athlete constantly challenges his physical limits during competitions.