认为比较可靠的方法是使用固定小倾斜角的支竿或支架，用改变高度调节取样面积。
The relative reliable way is using fixed minor slope Angle of supporting rod or trestle and changing the height of camera to obtain different sample area.
用一只长竿支起不大不小的竹窗，端起沏好的茶，依靠在窗栏边。
With a bamboo pole support from sort of a small window, porting brew good tea, relying on the Windows side bar.
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