• population density - 引用次数：41

  It has the characters of small individual size,fast breeding,the high population density,great harmness,and it can harm more than 150 crops.

  它具有个体小、繁殖快、种群密度高、为害重等特点,可为害150余种作物。

  参考来源 - 黄花蒿杀螨物质活性追踪及杀螨作用机理研究
• population density - 引用次数：37

  Obviously,the population density of ring-necked pheasants in Liaoning was lower than those in other provinces and other countries abroad,so conservation strategies to recover its population were discussed.

  辽宁省调查地区的环颈雉种群密度明显低于其他省市和欧美地区,应采取加强宣传教育,保护栖息环境等措施。

  参考来源 - 辽宁省环颈雉种群密度初步调查
• population density - 引用次数：6

  参考来源 - 德国小蠊的生物学特性及拟除虫菊酯对其作用机理的研究

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