It also challenges the labor force supply and the pension system.

这也对劳动力供给和养老金制度提出了挑战。

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In refer to the foundation of the classical transfer model of labor force, lead into system variable, and based Chinese system background, construct the decision model of rural labor force transfer.

在借鉴经典劳动力转移模型的基础上，引入制度变量，重新构造基于中国制度背景的农村劳动力转移决策模型。

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Several Bridges can be monitored simultaneously by the cluster monitoring system of bridge, which can lower greatly the management cost and save the resource of labor force and material.

桥梁集群监测系统能够同时对辖区内多座桥梁的健康状态进行远程实时自动监测，极大地降低桥梁的管理费用，节约大量的人力和物力。

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