Water enters a lake from inflowing rivers, from underwater seeps and springs, from overland flow off the surrounding land, and from rain falling directly on the lake surface.
湖中的水来自于河流的水、地下渗入的水和泉水、从四周地面流进来的水，还有直接降到湖面的雨水。
Discovering the inputs and outputs of rivers is a matter of measuring the discharges of every inflowing and outflowing stream and river.
发现河流的输入和输出，就是测量每一条流入和流出的河流的流量。
Discovering the inputs and outputs of rivers is a matter of measuring the discharges of every inflowing and outflowing stream and river.
发现河流的输入和输出，就是测量每一条流入和流出的河流的流量。
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