density of pollen 花粉浓度
Within the tree height, there was a trend for pollen density to increase with height.
在树高范围内，花粉浓度有由下至上增加的趋势；
The pollen density of different direction is affected by the main wind direction, 58.07% of pollen comes from the main wind direction.
不同方位的花粉密度受主风频率影响，主风方向花粉密度占58.07%。
The pollen density of different direction was affected by the main wind direction, 58.07% of pollen came from the main wind direction.
不同方位的花粉密度受主风频率影响，主风方向花粉密度占58.07%。
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