记得是2002年的圣诞节那天,搬新家了,没有专门的书房放置电脑。因为家居布置的关系,无法像以前一样,将电脑放置在客厅,只好将电脑放置在卧室。卧室的面积为14平方,电脑放置在房间的西南角,位置离床头的距离为3米(见图1)。家住郊区,晚上万籁俱寂,电脑风扇却发出低频的嗡嗡声,让 I remember in 2002 Christmas day, moved to a new home, there is no dedicated study put the computer. Due to the layout of the home, the computer can not be placed in the living room as before, leaving the computer in the bedroom. The bedroom is 14 square feet and the computer is placed in the southwestern corner of the room at a distance of 3 meters from the bed (see Figure 1). I live in the suburbs, at night, all the silence, the computer fan has issued a low-frequency buzz, so