英语词汇echelon grating怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	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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