通常来说，应用程序在运行时既要花费一些时间来运行用户代码，也要花费一些时间来运行“系统代码”，例如内核系统调用。

Typically, applications spend some of their time in user code and some in "system code," such as kernel system calls.

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通常来说，应用程序在运行时既要花费一些时间来运行用户代码，也要花费一些时间来运行“系统代码”，例如内核系统调用。

Typically, applications spend some of their time in user code and some in "system code," such as kernel system calls.

youdao