Average Angle and standard deviation also available.
平均值和标准背离值同样是被用到的。
With the increase of age, the average branch Angle of different grades is totally increase.
各级分枝的平均分枝角度随树龄的增大而呈现不同的波动趋势，但总体来说略有增加。
With the increase of age, the average branch Angle of different grades is totally increase.
各级分枝的平均分枝角度随树龄的增大而呈现不同的波动趋势，但总体来说略有增加。
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