echelons
n. 梯次编队；阶层（echelon 的复数）
v. 使列成梯队（echelon 的第三人称单数）
例句
Slowly, they have worked their way into the higher echelons of discipline after discipline.
渐渐地她们已经加入了各个学科的最高一级的梯队里。
But attitudes remain highly conservative and very few women are found in the upper echelons.
保守态度依然占主导，极少数女性在社会高层占有一席之地。
He distinguished himself at Austerlitz in that admirable march in echelons effected under the enemy's fire.
他曾在奥斯特里茨参加了那次英勇的冒着敌人炮火前进的梯形队伍。
