Flexible exchange rates seem to perform better in the face of shifts in export demand. 看来变动汇率在面临出口需求变动时能发挥较好的作用。
The variations in demand present a challenge to the operations manager to effectively use the perishable service capacity. 因为服务具有生产消费同时性的特点，所以服务产品无法储存，服务需求变动会对有效利用易逝的服务供给产生影响。
