Conversely, a drop in average wind speed will significantly reduce the power output.
与此相反，平均风速的减慢会明显减少电力的产出。
Measure average wind speed by anemometer. Find out wind direction by light thread and compass.
用风速计量度平均风速，用一条轻的线和一个指南针找出风向。
Measure average wind speed by anemometer . Find out wind direction by light thread and compass.
用风速计量度平均风速，用一条轻的线和一个指南针找出风向。
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