关于where引导的先行词的问题

更新时间2019-08-28 04:03:25

the water flows downward from a high-level reservoir built in a dam to the low-level reservoir in the power station where the reversible turbines work as an operate generator to produce electricity

这里的where先行词是power station还是low-level reservoir ? 为什么呢

where前的先行词是看就近原则吗？谢谢