As mines age, ore grades decline, since the best stuff is usually dug up first.
随着矿山年龄的增长，铁矿石的等级下滑，因为最好的往往被最先发掘。
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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