事先的英文：
in advance
before
prior

参考例句：
  • Speak for seats ahead of time
    事先申请座位
  • Claire wished she'd primed Sarah beforehand.
    克莱尔真希望她事先指点过萨拉。
  • The Best impromptu speeches are the ones written well in advance.
    最佳的即兴演讲是事先写好了稿子的演讲。
  • The airmen were under orders to abort their mission if on-board equipment showed the slightest glitch.
    飞行员事先接到命令，如果机载装备发生哪怕一点点的故障，也要取消所执行的任务。
  • The airmen were under orders to abort their mission if on-board equipment showed the slightest glitch
    飞行员事先接到命令，如果机载装备发生哪怕一点点的故障，也要取消所执行的任务。
  • Every question was a trap, a contrived progression towards a preconceived conclusion.
    每个问题都是一个陷阱，事先策划好了，一步一步达到早已作出的结论。
  • Spoken for reserved,etc in advance
    事先预订的
  • In advance; beforehand
    预先;事先
  • A preliminary investigation
    事先调查
  • (of a translation)done without previous preparation
    (指翻译)事先无准备的.
advance是什么意思：
v. （使）前进；发展；推进；预付；提出；提前；进展；上涨；被晋升；贷（款）
n. 前进；发展；预付款；增长
adj. 预先的；先行的
  • Prices are advancing.
    各种物价都在上涨。
  • The advance was sounded.
    进军号吹响了。
  • Petroleum is on the advance.
    石油价格正在上涨。
prior是什么意思：
adj. 优先的；在前的；较重要的；有优先权的
n. 上司；会长，副院长；前科；最高执政官
  • The offer is subject to prior sale.
    该报盘以未售出前为准。
  • I appreciate that you may have prior commitments.
    我体谅你可能事先已另有承诺。
  • I believe that theories are prior to observations as well as to experiments.
    我认为理论先于观察，也先于实验。

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