Meaning of jí xiàn:
jí xiàn
极限
Noun
limit; extreme boundary
Tā bùduàn tiǎozhàn zìjǐ de shēntǐ jíxiàn.
她不断挑战自己的身体极限。
She constantly challenges her physical limits.
Zhè zuò qiáo de shèjì kǎolǜ dàole jiànzhù cáiliào de chéngzhòng jíxiàn.
这座桥的设计考虑到了建筑材料的承重极限。
The design of this bridge takes into account the load-bearing limits of the building materials.