推送操作能将本地信息推送到一个远程的仓库，而操作能将远程仓库的信息复制到本地仓库。
A push transfers some local information to a remote repository, and a pull copies remote information to the local repository.
信息推送服务基于推送技术，又不等同于推送技术，它还涉及到服务对象的问题。
Information push service is based on push technology, but not the same with push technology, besides, it concerns the problem of service objective.
信息推送服务基于推送技术，又不等同于推送技术，它还涉及到服务对象的问题。
Information push service is based on push technology, but not the same with push technology, besides, it concerns the problem of service objective.
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