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

I sort of blocked it out with the circles, but then you can go put in two servings, and you put what time of day you had it and then the program will be able to do its work.

我把它圈了出来,你输入说是两份,之后输入进食的时间,系统随后就能运行分析

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选