这些状态帮助空闲中的系统节省电能。
These states can provide power savings when the system is idle.
介绍通风机通过调节速度节省电能的原理和方法。
This paper introduces the fan's principle and ways saving electricity by governing speed.
采用此开关，既可大大节省电能，也可使路灯的寿命得到延长。
Applied, the road lamp achieves its characteristics of conserving electricity and long lifespan.
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