n.能見度；可見性

Fog restricted visibility. 霧天能見度很低。

Dense fog is covering roads in the north and visibility is very poor. 濃霧籠罩了北部的公路，能見度很低。

The visibility of the lunar formations depends on their illumination by the sun. 月球結(jié)構(gòu)的可見性取決于太陽對它們的照明。

n.看不見；隱形

n.[數(shù)]可除性；可約性