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- 在生意上，你必须事先估计到你的竞争对手会如何行动。
In business, you've got to anticipate how your competitors will act.
- 我们事先就知道有这个问题。
We were aware of the problem beforehand.
- 我体谅你可能事先已另有承诺。
I appreciate that you may have prior commitments.
- 为了确定他在家，我事先打电话给他。
To make sure that he was at home, I called him up in advance.
- 买房子不事先估价是不明智的。
It would be unwise to buy the house before having it appraised.
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