单词:echelons
n. a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
echelon的用法和样例:
词汇搭配
- echelon design分组设计
- echelon formation梯形队形
- echelon folds阶状褶皱
- forward echelon第一梯队
- echelon matrix梯(矩)阵
- echelon form梯形
- assault echelon突击梯队
- echelon faults雁行断层
- echelon clouds梯状云
- echelon lens阶梯透镜
- echelon grating阶梯光栅
- en echelon雁列式的
- echelon prism阶梯棱镜
- echelon folding雁行状褶皱
- echelon maintenance分级维修
- advanced echelon先头梯队
- echelon structure雁行构造,雁行式构造...
经典引文
The higher echelons of the law and politics have become almost an Oxford preserve.
出自:Times
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