overlay

覆盖

A polar projection of half or more of the celestial sphere on a chart equipped with an adjustable overlay to show the stars visible at a particular time and place.

星座一览图天体球的一半或多半在平面图上的极投影图，这种图具有可调节的遮蔽物以显示在给定时刻和位置可见的恒星

An open framework made of strips of metal, wood, or similar material overlapped or overlaid in a regular, usually crisscross pattern.

格构开放式格架，由金属片。木片或相类似原料搭叠成格状，通常用交叉方式构成