这一转变已降低了中国主要湖泊和水库的污染，使人们的饮用水更加安全。
This switch has decreased pollution in the country's major lakes and reservoirs and made drinking water safer for people.
河流的淤积和水库的库容减小使得洪水的危险大大增加。
Like soil deposits along rivers, that increases the risk of flooding.
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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