The subway line built to link Olympic venues in Beijing began trial operation Monday, but it is open exclusively to the Games' workers, volunteers and media people.
北京地铁奥运支线28日正式开始载客试运营，但只限于奥运会有关工作人员、志愿者和媒体人员等。
It requires various factors to host a successful Olympic Games, such as venue construction and operation, city operation, environment improvement, media service, volunteer service and security.
举办一届成功的奥运会，涉及多方面因素，如场馆建设和运行、城市运行保障、环境整治、新闻宣传、志愿者服务、安全保障等。
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