智能风扇设计 能使电风扇具有对环境进行检测的功能，当房间里面没有人时能自动的关闭电风扇；当温度下降时能自动的减小风速甚至关闭风扇-The smart fan design enables fans environmental detection function can automatically turn off fans when no one inside the room　automatically when the temperature drops to reduce wind speed or even shut down the fan