1.  in advance
2.  beforehand

• 1. 预先: in advance | beforehand ad | before hand
• 2. 预先警告: forewarn | premonition | precaution | presage
• 3. 预先考虑: anticipate | premeditate | think ahead | preconsideration

更多释义

• 1.需用晚餐者，请预先通知我们。
  Please give us prior notice if you need an evening meal.
  dict.yoduao.com
• 2.要是我们预先知道这事就好了。
  I wish we'd known about it beforehand.
  dict.yoduao.com
• 3.她如何预先知道我将出门的？
  How could she tell beforehand that I was going to go out?
  dict.yoduao.com

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