At the top is the user, or application, space.

最上面是用户(或应用程序)空间。

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This section walks through the construction of a few system calls to demonstrate their implementation and use by a user-space application.

本节将介绍几个系统调用的构造，从而展示它们的实现和用户空间应用程序对它们的使用。

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This provides the system call interface that connects to the kernel and provides the mechanism to transition between the user-space application and the kernel.

它提供了连接内核的系统调用接口，还提供了在用户空间应用程序和内核之间进行转换的机制。

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Ridley Scott might like to say no one can hear you scream in space, but another application loaded onto the device will put that to the test by playing user-submitted shrieks and recording them with the handset's microphone as they playback.

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