Incline the wind meter to find the maximum wind speed direction. 运用风速计去发现最大风速及风向。
The impeller rotates, causing air to enter the fan near the shaft and move perpendicularly from the shaft to the opening in the scroll-shaped fan casing. 气流经过风叶时会使风叶旋转，利用这种特性制成了多种设备，如风速计和风力发电机。
