They revealed output powers ranging from about 1 horsepower to perhaps 60 for the largest wheels and confirmed that for maximum efficiency, the water should pass across the blades as smoothly as possible and fall away with minimum speed, having given up almost all of its kinetic energy.
词汇讲解：
blade /bleɪd/ n. (刀﹑ 剑﹑ 凿等的)刃;(划水桨﹑ 螺旋桨﹑ 锹﹑ 铲﹑ 板球击球板等的)扁宽平面部分
kinetic /kɪ'netɪk/ adj. 运动的，运动引起的
结构划分：
They revealed output powers (ranging from about 1 horsepower to perhaps 60) (for the largest wheels) and confirmed that (for maximum efficiency), the water should pass across the blades as smoothly as possible and fall away with minimum speed, (having given up almost all of its kinetic energy).
深度分析：
这个句子主干就是：
They revealed output powers and confirmed that
宾语从句的主干：the water should pass across the blades as smoothly as possible and fall away with minimum speed
中文：水应该从叶轮上尽可能光滑地流过，并以最小的速度流走
修饰一：(ranging from about 1 horsepower to perhaps 60)，非谓语动词
中文：输出功率范围是从1马力到最大水轮可能输出的60马力
修饰二：(for the largest wheels)，介词短语
中文：对于最大水轮
修饰三：(for maximum efficiency)，介词短语
中文：为了达到最高效率
修饰四：(having given up almost all of its kinetic energy)，非谓语动词
中文：释放水的几乎所有动能
参考翻译：
它们(调查)显示输出功率范围是从1马力到最大水轮可能输出的60马力;它们也确定了要达到最高效率，水应该从叶轮上尽可能光滑地流过，并以最小的速度流走，释放水的几乎所有动能。
