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- 论坛新贴
echelon ['eʃə'lɔn]
基本释义
- n. 梯形,梯阵,梯次编队
vt. 排成梯队
vi. 形成梯队
英英解释
2个名词解释
- 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