Computers built according to Morris's rule would not attempt to be utterly proof against cracker, but they would be impossible to enter without leaving the digital equivalent of fingerprints.

根据Morris规则构建的计算机不会试图成为针对黑客的完全证据，但他们将无法在不留下指纹的电子证据的时候进入系统。

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A simple experiment that sends photons through three slits provides the best proof yet of an important axiom of quantum theory called Born's rule, say physicists in Canada and Austria.

加拿大和奥地利的物理学家介绍，这个简单的实验通过三个缝发出光子，为量子理论的一个重要公理“波恩定则”提供了最好的证明。

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Sales: As a general rule, anyone who is a source of income for a company will be safe, so salespeople - especially in recession-proof industries - have little to worry about.

销售：一般来讲，任何人只要是公司的收入来源，他都会安全，所以销售人员——特别是在抗衰退行业——几乎不用担心。

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Few things would worry the Kremlin more than proof that political freedom, the rule of law and sensible foreign policy work well in nearby countries.

ECONOMIST: The pragmatic argument for American engagement

One basic rule for limit-making is that the burden of proof should fall on those who want change especially since the changers often want to keep on changing indefinitely: cutting the abortion limit by a fortnight was, for some, merely an interim goal on the way to a tighter squeeze or an outright ban.

ECONOMIST: Bagehot

As a rule of thumb, products that speak to basic needs are more recession proof.

FORBES: Is Your Marketing Ready for a Double Dip?