除非在这里修个水库，才能解决灌溉问题。
Only when a reservoir is built here can we solve our irrigation problem.
大坝后面水库中的储水，加上用来灌溉土地的水，会增加附近地区的潮湿度，使降水量提高。
Water in reservoirs behind dams, plus the water used to irrigate nearby land puts more moisture in the air, which falls as precipitation.
他将林地和草原改造成为农田，使江河变成湖泊和水库，用于灌溉或用于水力发电。
He has transformed woodlands and prairies into farms and made lakes and reserviors out of rivers for irrigation purposes or hydroelectric power.
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