wú xiàn qī
unlimited (time) duration
wú xiàn fēng guāng zài xiǎn fēng
The boundless vista is at the perilous peak (proverb)
fig. exhilaration follows a hard-won victory
wú xiàn xiǎo
infinitesimal
infinitely small
wú xiàn xiǎo shù
infinitesimal
infinite decimal expansion