... 树干材积 stem volume 带皮材积 volume outside bark 去皮材积 volume inside bark ...
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尤以用带皮材积公式估算去皮材积比用去皮材积公式估计要准确，平均只小2.3%。
For debarked trees, the volume equation for trees with barks was actually more accurate, underestimating volume at average rate of 2.3%.
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