假如按人类五官的职能划分,眼睛和耳朵是接收外界信息的主要工具。可是受限于功能构造,眼睛只能接收人体正前方的信息,可视范围稍稍大于180°,如果要观看旁边或者身后的事物,我们就需要用转动脑袋或者身体才能完成动作。相对而言,耳朵分布在人体两侧,接收360°全方位的信息,不管是身前身后,还是 If divided by the function of human facial features, eyes and ears are the main tool to receive outside information. However, due to the functional structure, the eye can only receive information just in front of the human body. The visual range is slightly larger than 180 °. If we want to watch the side or the back, we need to turn our head or body to complete the action. Relatively speaking, the ears are distributed on both sides of the human body to receive 360 ​​° omni-directional information, whether behind or in front