To others, dreams denote night-time learning or problem-solving, even automatic sifting of the mind's detritus, the skimming off of useless information to be dumped like so much mental junk.

其他人认为梦表示夜间学习或解决问题的过程，甚至是思想碎片的自动筛选过程，像清除思想垃圾一样清除无效信息。

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Don't waste time learning a lot of useless words in isolation. The best way of learning English words is to blurt out as many authentic sentences as you can.

不要浪费时间孤立地学习没有用的单词。学习英语单词最好的方法就是脱口而出尽量多的地道句子。

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They have become so ubiquitous that no one, no matter how hard he or she tries, can avoid learning some useless factoid about the latest television "star."

这些节目已经广泛普及，不论人们怎么努力，都会不可避免地记住一些有关最新电视“明星”的无用信息。

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Further, machine learning tools, which many companies claim they use to solve such causation inference, are fundamentally useless against this objective, as they are based on predicting correlations with no causal structure.

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