他们收集的数据涉及到14种变量，包括人类身高，黄金价格，树木年轮密度，以及欧洲工业化之前公元1500年到1800年之间的温度变化。
They collected data on 14 variables, such as human height, the price of gold, tree ring width, and temperature from pre-industrial Europe between the years 1500 and 1800.
解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。
So it is very important to find out the variation regulation of wood ring density in growth process.
解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。
So it is very important to find out the variation regulation of wood ring density in growth process.
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