echelon

[军]梯形, 梯阵, 梯次编队英释中释na rank or level of authority in an organization, business etc, or the people at that level

1 in echelon,排成梯队的(地)；梯次配置的(地)

2 en echelon,雁列式的；梯形

1 Their clients are drawn from the highest echelons of society..他们的客户是从社会最高层吸引来的。