When a peer closes its socket (resulting in the issuance of a SHUTDOWN primitive), both endpoints are required to close, and no further data movement is permitted in either direction.
当一端关闭自己的套接字时(导致产生一个SHUTDOWN原语)，对等的两端全部需要关闭，将来任何一端都不允许再进行数据的移动了。
This issuance system possesses multi-functions of map-layer control and management, data searching and retrieval, and spatial analysis operation of basic information.
该网络发布系统具有图层控制与管理、数据查询检索、基本信息的空间分析操作功能。
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