U never know what would happen next second.

你永远不知道下一秒会发生什么。

youdao

Never frown, even when u are sad, because u never know who is falling in love with your smile.

永远不要皱眉，甚至当你伤心的时候，因为你不知道有人是多么倾心你的微笑。

youdao

U: be UNDERSTANDING to your fellow beings. You may never know what other person might have gone through in life so never be judgmental in your approach.

理解你的同伴。你可能不知道别人生活中经历过什么，所以永远不要从你的角度去评判别人。

youdao

"The difficulty with counterfeiting is you never know where you really stand U.S. Customs examines only a small portion of the goods entering the country, " said Joe Nauman, executive vice president for corporate and legal affairs at Acushnet, which makes Titleist balls and clubs and FootJoy shoes.

WSJ: Psst��Wanna Buy a Counterfeit Golf Club? | Golf Journal by John Paul Newport

Although you'd never know it from market volatility, the financial fever in the U.S. may be about to break.

FORBES: Magazine Article