| environ. | 灵活的环境保护方法 | flexible approach to environmental protection Plans, referred to in various rules as emissions averaging, or flexible compliance plans, allow facilities to undercontrol some emission points that are too costly to control to mandated levels as long as these units are balanced by overcontrolling other emission units that are more cost-effective to control (指代约束平均排放量，或弹性兼容规则，允许设施控制在排放临界点之内，这些临界点花费太大而无法回到可控水平，只要这些单元能够平衡控制其他更高效的排放单元。) |
