official/ ə'fɪʃl /

1.adjective
(approved) 官方的

the official unemployment figures
官方的失业统计数据
2.adjective [+residence] [ visit] 
(job-related) 公务的

the Irish President's official residence
爱尔兰总统的官邸
Tony Blair is currently on an official visit to Hungary.
托尼布莱尔正在对匈牙利进行正式访问。
3.noun [c] 
(in government,organization etc) 官员