实验设计，安排及参与者：随机选取意大利托斯卡纳社区的698名年龄在65岁以上的老人进行纵向研究。
Design, Setting, and Participants: Longitudinal study of 698 community-living persons 65 years or older who were randomly selected from a population registry in Tuscany, Italy.
最后密度就是项目安排紧密。(如：纵向的与水平的结构)。
Finally, density is the compactness of the project (a vertical versus horizontal structure, for example).
主要结论为通过合理地安排工艺步骤，能够在对原有结构不产生影响的情况下，得到性能令人满意的纵向PN P晶体管。
Major conclusion is: it is possible to achieve ideal vertical PNP transistor by appropriately re-arranging process steps without affecting the original structure.
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