这种劳动者减少数量超过劳动者增加数量的人口统计要素对于一个国家来说非常难以逆转。
That sort of demographic momentum - with far more people preparing to leave the workforce than are entering it - is extremely difficult for a nation to reverse.
以统计学的研究考察上述互动过程中各个要素之间的关系。
Statistical methods were used to examine the correlations among the various components in the pathways.
教学设计是以优化教学效果为目的，对教学系统中的各个要素进行系统计划的过程。
Instructional design aims at optimizing instructional effects and it is the course of systematical design of each factor in instructional system.
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