1.
according to previous appointment.
他们要按照事先的约定。
2.
A preceding occurrence, cause, or event.
先前的前面的事件，事情
3.
Something afforded or deserving prior attention.
优先考虑的事或值得优先注意的事
4.
said or done without having been planned or written in advance.
说话做事没有事先计划或预先写好的。
5.
predetermined value
预先确定的值，事先规定的值
6.
prior informed consent procedure
事先知情的同意程序
7.
She made an advance payment for her new car.
她事先预付了她的新车。
8.
Road building is a top priority.
筑路是最优先考虑的事。
9.
preferred above all others.
比其他事物先被选到的。
10.
chosen in preference to another.
比同类事物先被选到的。
11.
Is there a precedent for what you want me to do?
你要我做的事有先例吗?
12.
(of a translation)done without previous preparation
（指翻译）事先无准备的.
13.
a ready-cooked dinner
事先煮好的一顿饭菜
14.
The act or right of occupying a place beforehand or in advance.
先占权事先或预先占据某地的行为或权利
15.
Mr. Blake is the Sales and Marketing Director. Mr. Long,
布莱克先生是主管销售的董事。朗先生，
16.
"Tickets will be issued by him on a "first come, first served Basis"."
剧干事发票的原则是"先到先买"。
17.
First things first!Pass your exams first before you start talking about going to university.
事情有先有后。先通过考试再谈上大学的事吧。
18.
The unfinished business of yesterday must take precedence of new business.
昨天未了的事必须比今天的事先做。