I don't understand why you think we need yet another tier of management.我不明白你为什么认为我们还需要一个管理层级。A new management hierarchy was created within the company.公司内部建立了一套新的管理层级制度。Islanders campaigned for the abolition of one of the three tiers of municipal power on the island.岛上居民发起了一场运动,要求废除该岛三级市政管理层级中的一级。