詞匯精練——waterpower

Raising water and grinding corn were by no means the only uses of the waterpower mill, and during the following centuries, the applications of waterpower kept pace with the developing technologies of mining, iron working, paper making, and the wool and cotton industries. Water was the main source of mechanical power, and by the end of the seventeenth century, England alone is thought to have had some 20,000 working mill. There was much debate on the relative efficiencies of different types of waterwheels.
The phrase “the application of waterpower” in the passage is closest in meaning to
Othe uses to which waterpower was put
Othe improvement made to waterpower
Othe method by which waterpower was supplied
Othe source of waterpower available

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