Secondary material in poplar tree has important and practical significance to probing the mechanism of poplar tree's resistance to longborn beetle and nurturing the new insect-resistant tree species on the research of resistance to Anoplohora glabripenni.
杨树次生物质对光肩星天牛抗性研究对于探明杨树抗天牛机制，培育筛选新的抗虫树种具有重要理论和实践意义。
参考来源 - 毛白杨韧皮部次生代谢物质提取分离及对光肩星天牛抗性的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Organize the secondary material in order of importance.
根据重要性的顺序组织次要材料。
A bulk layer includes the primary material and is free of the secondary material.
一主体层包含该主要材料而不含该次要材料。
The raw materials are simple in HOE LEONG company, it is PVC colophony and some secondary material.
和隆公司的原材料比较简单，主要就是PVC树脂和几种辅料。
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