The average population density of the world is 47 persons per square mile.
世界平均人口密度为每平方英里47人。
Ni : Average population density in area i. To simplify the analysis, Earth’s surface is divided into a grid of squares i, and the distribution is assumed to be uniform in each.
Ni：指i区的平均人口密度，为了简化分析，地球表面被按照网格分成多个i区，每个区的分布假定是统一的。
Regulation of self- thinning is that relationship between DBH and average density of population accords with negative power function.
樟子松种群自疏规律为：平均胸径与密度的关系符合负幂函数模型。
Compared with the ramet population in the semi-fixed dunes, the ramet population in the fixed dunes exhibited higher ramet density, smaller average ramet spacing and similar ramet height.
且固定沙丘的花棒分株种群比半固定沙丘具有较大的密度、较小的平均株距及相似的分株高度。
In Haojiang district, the population density is low, the average land area is large, and there is plenty of land for developing.
濠江区人口密度低，人均土地面积大，有大量土地可供开发。
In Haojiang district, the population density is low, the average land area is large, and there is plenty of land for developing.
濠江区人口密度低，人均土地面积大，有大量土地可供开发。
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