生态系统的数学模型同样表明，多样性并不能保证生态系统的稳定性——事实上恰恰相反。

Mathematical models of ecosystems likewise suggest that diversity does not guarantee ecosystem stability—just the opposite, in fact.

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与使用不同用户界面处理不同it系统相反，用户只需要使用单一的用户界面来处理一个IT系统，这就是门户。

Instead of dealing with different it systems with different user interfaces, users only need to deal with one it system, the portal, with a single user interface.

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相反，要想保护系统，必须时刻保持警惕，不断创建、寻找、应用、测试和调整许多安全措施。

Instead, defending a system requires constant vigilance to create, find, apply, test, and adjust any number of individual measures.

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It has the function, in other words, of negating its own meaning in another semiotic system, in this case the semiotic system of the stoplight.

也就是说，他有这样那样的功能，在不同语义系统中表示的甚至完全相反，就像红灯表示的这些不同含义一样。

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