Dive into System Preferences and there are more changes to be seen.
进入系统设置,将会看到更多变化。
The latter technique, which I favor, must first be turned on in System Preferences.
我喜欢后面一种方法,但是必须事先通过System Preferences进行设置。
You can set it to do this in the Energy Saver preference pane in System Preferences.
你可以在“系统偏好设置”的“节能器”选项中设置。
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