The unbalanced population structure is the direct source, since the basic assumption spang is long term relatively stable population structure.
应该说人口结构失衡是直接的诱因，因为收现付机制的基本约束条件在于长期相对稳定的人口结构。
The unbalanced population structure is the direct source, since the basic assumption spang is long term relatively stable population structure.
应该说人口结构失衡是直接的诱因，因为收现付机制的基本约束条件在于长期相对稳定的人口结构。
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