双轨

double-track;two-tier
美国政府对于给联合国出资采取了～方针，一方面同意支付新的维和行动，而另一方面却继续克扣其固定会费。The US government adopted a“two-track”approach toward financing the UN,agreeing to pay for new peacekeeping operations while continuing to withhold its regular contribution./～决定dualtrack decision/～铁路dou ble-track railway/～制two-tier system;double-track system/～制价格double-tiered price system;dual-track price system(of official and market prices)