annual operation cost of hydropower station

例句：

1. 1.The annual operation cost of the hydropower station is a significant factor in its profitability.
   水电站的年度运营成本是其盈利能力的一个关键因素。
2. 2. The company's annual operation cost for this project is $5 million.
   该公司为该项目的年度运营成本为500万美元。
3. 3. To reduce the annual operation cost, the company has implemented energy-saving measures.
   为了降低年度运营成本，公司已经实施了节能措施。