environ. | debt service The fees or amount of money necessary to pay interest on an outstanding debt, the principal of maturing serial bonds, and the required contributions to an amortization or sinking fund for term bonds | 债务服务 (对未偿还债务、到期的分期偿付证券、分期偿还所需的物品或偿债基金等,应支付利息的货币总量或费用。) |