They found that performance rose through roughly the first decade on the job before flattening off, then starting to dip after around 15 years.

他们发现，在工作的头十年左右， 绩效有所上升， 然后趋于平缓，然后在大约 15 年后开始下降。

The fraction of a country's population living in cities follows an attenuated s shape, rising slowly during an initial stage of growth, more quickly during an acceleration stage, then slowing and flattening off during a terminal stage.

一个国家居住在城市的人口比例呈衰减的 S 形，在增长的初始阶段缓慢上升， 在加速阶段上升更快， 然后在末期放缓并趋于平缓。