The uncertain longevity and endogenous fertility were introduced into a stochastic model in the continuous time, overlapping generations′ economy.

在生育率内生的情况下，引入寿命不确定性，建立生育率、死亡概率和经济增长率的随机动态模型。

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Each Administration and every major study, review, and strategy document continued to plan for two major operations in overlapping time frames.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2

Thus, the idea of conducting two regional conflicts simultaneously was abandoned in favor of less precise terms, such as overlapping time frames or on short notice.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2

The requirement to perform two such operations in an overlapping time frame, while maintaining other critical deployment and retain a strategic reserve would strain a force of this size and character, perhaps to the breaking point.

CENTERFORSECURITYPOLICY: Section IV: Building a Two-MRC Force for the 21st Century