青年拉好你的拉链
[qīng nián lā hăo nĭ de lā liàn]
'Youth, Pull Up Your Zipper.' It has multiple implied meanings. On one hand, it could simply mean advising someone, probably youths, to dress decently. On the other hand, it might be implying to be cautious about some behaviors, similar to 'pull yourself together'. Both imply guidance and warning towards someone's actions.