要有效地掌握社会发展的趋向,必须了解人们日常活动中以往发生的变化,其中包括人们如何安排时间这个方面的变化。要弄清发生了什么事件,它又是由于什么因素的影响,这是很重要的。此外,对过去发生变化的意义和结果也需要加以评价。同样地,对人们未来活动中可能发生的变化及其中最重要行为历时的长短,也应当加以鉴别和评价。后边这一项和过去的变 To effectively grasp the trend of social development, we must understand the changes that have taken place in the daily activities of the people, including how people arrange the changes in time. It is important to understand what happened and how it is affected again. In addition, the significance and the result of changes in the past also need to be evaluated. Similarly, the changes that people may have in their future activities and the duration of their most important actions should also be identified and evaluated. Behind this one and the past change