从所有的区域和它们的估计人口列表中得到总分组数，再将总分组数除以30得到分组抽样间隔k。
The total number of clusters, drawn from a list of all sections and their population estimates, is divided by 30 to obtain the cluster interval K.
市场细分是划分市场或人口问题纳入分组类似的动机。
Market segmentation is the division of the market or population into subgroups with similar motivations.
课程重点在于增进听力以及口说能力，包含分组活动、讨论，以及根据阅读、影片、音乐和艺术而作的个人口头报告。
Focuses on listening comprehension and speaking, with group activities, discussions and individual oral reports based on readings, films, music and art.
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