If you just scramble a sentence, it's pretty useless because the recipients are never going to be able to reverse the process.

如果你只是加密一个句子，这是毫无用处的,因为收件人没法将这个句子,反加密出来。

哈佛公开课 - 计算机科学课程节选

So it's almost as if functions really are useless because they have no ultimate effect.

所以几乎是函数是没起作用的,因为它们没有最终的效果。

哈佛公开课 - 计算机科学课程节选

Typically this meant plowing money into commodities, land, and other scarce if useless things (such as fine art), on the assumption that investment vehicles definitively limited in supply would hold their value in the context of dollar weakness.

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I'm sure you'll agree that New York would be a better, more hospitable and harmonious place if every useless bank that's gone up over the past decade were replaced by a pastry shop that sold some version of the Trianon.

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All the inspiration in the world is useless if the environment is destroyed by our species.

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