GbEng
我们事先就知道有这个问题. We were aware of the problem beforehand.
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.
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.
我体谅你可能事先已另有承诺. I appreciate that you may have prior commitments.
她预见到母亲的一切需要而事先做好安排. She anticipates all her mother's needs.
密码一种密码系统，其中固定长度的明文里的单元，通常为字母，被任意倒置或按事先确定的符号系统替换 A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code.
这次示威活动事先作了精心安排, 正好在首相访问时进行. The demonstration had been carefully stage-managed to coincide with the Prime Minister's visit.
她要求赔款遭到拒绝, 原因是她事先没有交纳保险费. Her claim was disallowed on the ground(s) that she had not paid her premium.