Then steam power entered the scene, putting the whole future of waterpower in doubt. 随后,蒸汽动力登上了历史舞台,让整个水力发电的前景一度遭到了怀疑。
Even the most reliable waterpower varied with the seasons and disappeared in a drought. 即使是最可靠的水力也会随着季节变化,也会因干旱而消失。
In the following centuries, increasingly sophisticated waterpower mills were built throughout the Roman Empire and beyond its boundaries in the Middle East and northern Europe. 在接下来的几个世纪里,在整个罗马帝国以及在中东和北欧边界以外的地方建造了越来越复杂的水力发电厂。