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。
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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