If you must move, don't follow a stream unless you know it, and in that case, you are not lost.

如果你非要走动的话，别顺着溪流走，除非你对它很熟悉。但是如果你很熟悉，那你就不会迷路了。

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You are not dreaming right now, unless you're asleep but if you're-- and you can't usually be immoral in a dream.

你们现在不是作梦，除了那些睡着的同学-,我们很少会在梦里做出不道德的事。

耶鲁公开课 - 心理学导论课程节选

So, in fact we may not find a sock at all and yet we don't seem to handle that at all unless if we don't find any socks, what do we do?

实际上我们可能找不到袜子,并且不用处理那些事情,前提是我们没有找到任何袜子，我们做什么呢？

哈佛公开课 - 计算机科学课程节选

The government said it would not hold talks with the ELN unless if showed "acts of peace" rather than words.

BBC: Uwe Breuer (l) at Aguas Claras airport in Colombia

This is not a problem if you hold a bond to maturity (unless you recently bought a newly issued long-term bond), but it will adversely impact bond fund prices.

FORBES: Buffett's Right, Bonds May Fall Victim To Inflation But Hold Them For Now

Last year, the Conservatives said that if they were elected, they would insist Sinn Fein would not get allowances unless they took their seats.

BBC: MP's attack on Sinn Fein expenses