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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unless you didn't know that, weren't aware of the art market yourself, it would be very important

除非你不知道，自己没意识到艺术市场，重要的是

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And Joe Jackson had this song which had the lyric, like, you can't get what you want unless you know what you want.

杰克森有句歌词这么写的,汝欲求之,必先知之

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And unless, you know, you've been hired to do Pirandello's Six Characters In Search Of An Author, this is not a great thing, because you get something that is really confusing.

可能一点关系也没有,要是你拍的是皮兰德娄的荒诞名剧,《六个找寻作家的角色》,那可能是件好事,因为你得到的是一个足够混乱的结果。

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"This is dangerous work -- unless you know how to control it, " he said.

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The problem is unless you know who the consumer is, and what their needs are you cannot fulfil them.

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Unless you know how the numbers were derived and have some understanding of their context, such probabilities help no one.

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