phon meaning in English

n.
【物理学】方〔响度单位〕。

Smile whenever you pick up the phon , for the caller will be able to notice it
无论什么时候打电话，拿起话筒的时候请微笑，因为对方能感觉到！
The sound level produced from your booth shall be limited to no more than 80 phons , as measured at a point 2 meters away from the border line of the booth
自己展间的产生音量规定值为：从离开展间边界线2 m的地方进行测量，测定值在80phon以下。