[] (about a system) having two levels（制度）两级的，双层的，双重的◆a two-tier system of interest rates利率双轨制◆a two-tier workforce (= where people are paid different rates for doing the same job)同工不同酬◆They operate a two-tier structure with management and supervisory boards.他们采用管理委员会和监督委员会这样的两级架构。