It may also act as a visual signal of adulthood, along with growing breasts and widening hips in girls and deeper chests and beards in boys. 随着女孩乳房的日益增大和臀部的加宽以及男孩胸部的加深和胡须的长出，阴毛也可能作为成年人的一种视觉信号。
Meanwhile, a Blind Spot Information System registers if another vehicle is in the offset rear blind spot alongside the car and alerts the driver via a visual signal. 与此同时，一个盲点信息系统登记，如果另一辆车是在后方的盲点抵消一起汽车，并提醒司机通过视觉信号。
