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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文章考虑了一类具有等变性质的五次哈密顿向量场的全局性质，得到了其全局相图并对参数空间进行了划分。

In this paper, we consider some planar quintic Hamiltonian vector field with Z3-equivariant property, get its global phase portraits, and classify its parameter space.

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