public use公共事业publicadj.公众的；公共的；公开的n.民众；公众；大众Public Relations Online网络公共关系public and private idea公私观念public security penalty治安处罚public relations theory公共关系理论Public emergency system公共应急体制Public Education Office公众教育官员public-key management公钥管理public interest posters公益海报public service industry公共服务业public emergent affairs突发事件