社会功能(SF)得分影响因素有：家庭月收入、工作时间制度、休闲娱乐机会、社会客观支持和两周内是否生病。
For SF of QOL, monthly family income, system of working hours, frequency of leisure entertainment, social objective support and illness during previous two weeks were the significant factors.
我国农作制度的历史演进过程大致可以划分为四个时期，即撂荒制、休闲制、轮种制和集约制。
The historical evolution of tillage system in China can be divided into four stages: abandoning cropping system, fallow cropping system, rotational cropping system, and intensive cropping system.
如果你一直渴望研究热狗、主题公园以及每周五天的工作日制度如何影响美国人的休闲文化，那就办好手续，去听一听衣阿华大学开设的“美国人的假期”这门课程吧。
If you've been longing to research how hot dogs, theme parks, and the five-day workweek have impacted American leisure culture, check out the University of Iowa course "The American Vacation".
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