gratings什么意思？

gratings的音标：gratings的英式发音音标为：[ɡ'reɪtɪŋz]gratings的美式发音音标为：[ɡ'reɪtɪŋz]...

The light is resolved by prisms, gratings, or by an interferometer.光线用棱镜 、 光栅或干涉仪分解.Many of the roofs were so full of holes that they looked like gratings.许多屋顶千穿百孔,象筛子一样.All gratings shall lie flat with no tendency to ro...