中国地区之间资源分布极不平衡，而选择上学则是一种迁入城市、享有资源的方式，这使得大学学历具有重要的资源分配作用。
The resources distribution is extremely imbalanced among different areas of China, and gong to college is a kind of way to enter city and enjoy its resources.
不同的元素在这一过程中具有不同的地球化学行为，按照其迁入迁出的强度，这些元素可以划分为活动组分、次活动组分和惰性组分3类。
These major elements can be divided into 3 parts as activity, sub-activity and non-activity based on the density of migration in and out.
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