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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