Increased efficiency in the use of water and wind helped with such tasks as pumping, milling, or sailing.
提高水和风的利用效率有助于抽水、碾磨或航行等工作。
2
In China today, the utilization efficiency of farming water is about 30-40 percent.
在今天的中国，农业用水的利用效率约为30%-40%。
3
They also proved that, in principle, the overshot wheel, a type of wheel in which an overhead stream of water powers the wheel, should win the efficiency competition.