Echelon
01
阶梯, 阶梯衍射光栅
a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
02
梯队, 梯队队形
a diagonal formation of things, especially used in military troops
03
等级, 阶层
a level or rank in an organization, profession, or society, indicating a person's status or authority within that hierarchy
例子
She worked hard for years to reach the upper echelons of the corporate world.
她努力工作多年，以达到企业世界的上层梯队。
His promotion moved him into the top echelon of academic researchers in his field.
他的晋升使他进入了该领域学术研究人员的最高梯队。
