在树高范围内，花粉浓度有由下至上增加的趋势；
Within the tree height, there was a trend for pollen density to increase with height.
它具有溶解性好，在低浓度时具有高黏度的特性。
It is characterized by the high solubility, and high stickiness at low temperature.
它具有溶解性好，在低浓度时具有高黏度的特性。
It is characterized by the high solubility, and high stickiness at low temperature.
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