好词典
previously
UK //ˈpriːviəsli//US //ˈpriːviəsli//
词源
源自中古英语previowsli，由previous（形容词，意为“先前的”）加副词后缀-ly构成，词根可追溯至拉丁语praevius（先行者）。
adverb
❶ 指在某个时间点或事件之前发生或存在的情况，常用于对比现在与过去的不同状态。
“She had previously worked as a teacher before becoming a writer.”
（她在成为作家之前曾当过老师。）
“The building was previously used as a hospital during the war.”
（这栋建筑在战争期间曾被用作医院。）
同义词:before, earlier, formerly, in the past, once
常见短语
as previously mentioned — 用于书面或正式场合，表示重申之前已经提过的事情。
“As previously mentioned, the meeting will start at 9 AM.”
（如前所述，会议将于上午9点开始。）
previously on — 电视剧或节目回放前情提要时的固定用语，提示观众之前的情节。
“Previously on Game of Thrones...”
（《权力的游戏》前情提要...）