n.职权的等级；阶层；梯队；梯次编队
v.排成梯形
The upper echelons are ABs and the middle,BCs. 上层称为AB级，中层称为BC级。
To arrange or take place in an echelon. 排成梯队排列成梯队或以梯队形式发生
A job in the lower echelon of the corporation. 一份公司底层工作
Be the Balance Upholder of Business Echelon! 成为企业梯队平衡的维护商！
Officers were drawn largely from the top echelons of society. 这些官员大都来自社会上层。
The top echelons of politics and the clergy are riven with dissent. 不满情绪使得政府高层以及宗教上层出现严重的分歧。
