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山核桃树皮的皮层均由9 - 12层富含营养物质的薄壁细胞组成，其机械性能在一定程度上影响着树皮对溃疡病抗性。
The cortex of bark was consist of 9-12 layer nutrient element parenchyma so its mechanical capability have influence on the resistance to the disease.
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