你可以在“系统偏好设置”的“节能器”选项中设置。
You can set it to do this in the Energy Saver preference pane in System Preferences.
Macintosh用户习惯使用系统偏好设置中软件更新来升级操作系统和系统软件。
Macintosh users are accustomed to using software Update in system Preferences to upgrade the operating system and system software.
如果你此时打开“系统偏好设置”，你就会看到你的桌面已经被设置为这些图片的循环了。
If you open up system preferences now, you can see that your desktop is set to cycle through these images.
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