再不疯狂我们就老了再不努力我们就完了
[zài bù fēng kuáng wŏ men jiù lăo le zài bù nŭ lì wŏ men jiù wán le]
It combines the meanings: If we don't live wildly now, we'll be too old; If we don’t work hard, everything will be over. It conveys the idea of not giving up and making full use of our youth time.