visibility /ˌviziˈbiliti]/ n. [u] 能见度，视程，可见性：Fog restricted visibility.雾天能见度很低。Visibility was down to 200 metres.能见度不足200米。The sand in the air reduced visibility to a hundred yards.空中的沙尘将能见距离降低到100 码。Under the glare of the street lamps, visibility was good.在街灯的照射下，可以看得很清楚。
visible /ˈvizəb(ə)l/ adj. (［反］invisible) 看得见的，可见的，有形的：visible stars 可见的星星；visible to the naked eyes 肉眼所看得到的；be visible with a microscope 可用显微镜看见
