1. At a former or past time; previously. 
   从前地以前或过去的时间；早先
2. 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
3. Formerly or already occupied. 
   先占的以前或已经占据的
4. Soak the blanket before you wash it. 
   洗毛毯以前先把它浸在水中。
5. I had collected material previous to writing. 
   我在写作以前先搜集了材料。

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• 1. ago
  again [?'gein] ad. 再一次;再,又...ago [?'g?u] ad. 以前...ahead [?'hed] ad. 在前,向前
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• 2. previously
  29 previous ['pri:vi?s] a.在前的，早先的...30 previously ['pri:vi?sli] ad.以前...31 primary ['praim?ri] a.首要的；最初的
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• 3. formerly
  fore [ f?:] ad.在前面 a.先前的...formerly [ 'f?:m?li] ad.以前，从前...forward [ 'f?:w?d] ad.向前，将来vt.转递
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• 4. before
  BorderLayout 边框布局...before 在前、以前...beforeFirst 移动到开头
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