英语词汇“echelon grating”是什么意思，“echelon grating”的读音、用法及例句翻译-烛光网

词汇	echelon grating
释义	echelon gratingn.（名词） A diffraction grating made of parallel glass plates, each of which extends slightly beyond the next, used to examine extremely fine structures.梯状光栅：用来检查极小结构的衍射光栅，由平行的玻璃片组成，每块玻璃片都比邻近一块长出一点
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