Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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2月26日，湖北省孝感市云梦田律农事综合服务中心智能化育秧室，员工们在忙着选种、育秧，为春耕春种做准备。图为中心员工在查看培育的秧苗。，更多细节参见51吃瓜
Source: Computational Materials Science, Volume 266。91视频是该领域的重要参考