| 1. | The recovery process necessitates waste stream segregation if water and chemical reuse are to offset capital and operational costs .
假如水和化学品回用可使投资和操作费得到补偿，则回收过程需要将废液流分开。 |
| 2. | 5 . very economical operational costs . and so on
在活性碳的过滤中，效果极佳。 |
| 3. | Discussion on reducing the operational cost of fuel boiler
降低燃油锅炉运行成本的探讨 |
| 4. | Reduces operational costs
节省营运成本 |
| 5. | Important role of technological progress in reducing operational cost of mine
科技进步在降低矿山企业生产成本中的重要作用 |
| 6. | Improving operational efficiency through communications , and lower operational costs
通过通信提高运作效率，并降低运作成本。 |
