a barrier that has parallel or crossed bars blocking a passage but admitting air
a frame of iron bars to hold a fire
optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum
造句
Both are polymer replicas of master gratings. 兩個都是標準光柵的聚合物復制品。
Conception of new gratings with better efficiency and lower stray light. 高效率和低雜散光的新光柵核心理念。