详细释义
Noun:
-
a body of troops arranged in a line
-
a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
用法讲解
- 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...
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