“高级官员”常见的英文表达有 senior official 或 high-ranking official。
senior official：侧重于表示在组织或机构中资历深、职位高的官员。例如：The senior official made an important announcement at the press conference.（这位高级官员在新闻发布会上做了一个重要宣布。）
high-ranking official：强调官员的职位等级较高。例如：A high-ranking official from the ministry was present at the meeting.（一位来自该部的高级别官员出席了会议 。）