In addition to the old-age insurance fee required to be paid by enterprises and individuals in a certain proportion, an extra amount is allowed to add to their accounts on a voluntary basis.
在规定企业和个人按一定比例缴纳养老保险费的同时，允许企业和职工个人在规定比例之外再可以自愿缴费到个人账户。
In addition, by studying the traffic flow distribution rule in the minimum spanning tree, it is found that the proportion of the minimum spanning tree in the total system is close to a constant.
此外，通过研究最小支撑树上的流量分布规律，发现最小支撑树上流量占总系统流量的比例接近于一个常数。
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