In this paper, cluster centre and the distance from point to the cluster centre was defined, and a dynamic analysis method for plane point set was put forword.

本文定义了聚类中心以及点到聚类中心的距离，提出了一种平面点集的动态聚类分析方法。

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To provide education for these groups, the National Centre for Non-Formal and Distance Education (NFDE) was established under the Ministry of Education, Culture, and Science (MECS) to coordinate all the efforts done at the national level.

UNESCO: Herder Families Literacy and Life Skills

If the Trafford Centre lives up to the developer's hype, these long-distance shoppers may be heading there in future.

ECONOMIST: Shopping