A working set is defined as the minimal set of results that will be accessed by the application within a particular period of time so that the application can work efficiently.

工作集是指在特定时间段内应用程序将访问的最小结果集，以使应用程序更高效地工作。

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There is usually a set time within which you can withdraw from the class, and if you withdraw after that time, it will influence your grade. This period for withdrawal is different at every school.

退课也有一定的时间限制，超过一定时间对你的成绩还是会有影响，各个学校对那个时间限制的要求有所不同。

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Miller and colleagues thus set out to examine whether hypoglycemia is a precipitating factor for mi, and if so, by how much it might increase the risk within a short period of time.

Miller和他的同事因此开始着手研究低血糖是否是MI诱发因素，以及如果是的话，它对短期内的MI风险增加的影响又有多大。

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Plus, exercising a put option (a contract to sell a security at a set price within a given time period) subjects you to the risks of market timing.

FORBES: Two Years Into The Bull Market, Portfolio Lessons Still Apply

Mentors and mentees meet approximately once a month and together both parties draw up a contract and set specific goals to be met within a defined period of time, from 6 to 12 months.

UNESCO: Social and Human Sciences