1. To reverse a previously held opinion or an earlier decision. 
   改变推翻先前的观点或以前的决定
2. Occurring before in time; earlier. 
   先前的时间上先发生的；较早的
3. she had previously lived in Chicago; he was previously president of a bank; better than anything previously proposed; a previously unquestioned attitude; antecedently arranged. 
   她以前住在芝加哥；他以前是一家银行的行长；比先前的提议都好；先前肯定的态度；事先安排。
4. At an earlier time. 
   先前地在早些时候
5. I had known her before; as I said before; he called me the day before but your call had come even earlier; her parents had died four years earlier; I mentioned that problem earlier. 
   我以前就认识她；正如我先前所说；他头天给我打了电话，但你的电话更早些；她的父母四年前死了；我先前提到过那个问题。

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• 1. previously
  prior a.优先的, 在前的...previously [5pri:vi[sli] ad. 先前，预先...primarily[5praIm[r[li] ad.首先；主要地
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• 2. anterior
  antephialtic = 抗夜惊...anterior = 先前...anteriorities = 居先
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• 3. antecede
  antebrachium 前臂...antecede 先前...antecedence 先行
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• 4. anteriority
  anterior 前面的...anteriority 先前...anteriorly 先前地
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