在学习一门语言时，习语是最难掌握的模块之一。

Idioms are one of the hardest parts of learning a language.

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这些门可以确保您的模块对它所需要的数据具有访问权限，而对它不需要的数据则没有访问权限。

The gates are to ensure that your module has access to the data it requires, and does not have access to data it does not require.

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如果您需要使内核扩展成为可识别键的内核扩展，那么您必须添加显式的保护门，通常在您的模块的所有条目和退出点处。

If you make a kernel extension key-aware, you must add explicit protection gates, typically at all entry and exit points of your module.

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