hoc：abbr.heavy organic chemical 重有机化学药品;held on charge 受指挥；
例：
The meetings will be held on an ad hoc basis.
会议将根据需要随时举行。
Research of Bandwidth Allocation Technology based on Mobile Ad Hoc Network.
基于分层移动ad hoc网络的'带宽分配技术研究。
Ad Hoc Expert Group on the Management of Statistical Information Technology.
统计信息技术管理问题特设专家组。
Research on Information Retrieval System with Routing for Ad Hoc Networks.
无线自组网中带路由的信息检索系统研究。
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