（四）调解民间纠纷，促进家庭和睦、邻里和谐、社区安宁；
Author(s): Guowang Yu, Xiaoning Guan, Yanan Zhang, Yaqi Zhao, Yanchao Zhang, Fan Zhang, Feng Zhou, Pengfei Lu
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On the stand there is an interactive table-top display that used to look impossibly modern in movies twenty years ago. With the swipe of a finger, a video plays. It is of a driver arriving at a supermarket where there is a waiting robot with bags of groceries it already knew you wanted.
(x_2-x_1)(x_2-x_0)(x_1-x_0). For an arbitrary ,