exist beforehand or prior to a certain point in time
例句
The goal of the study of multidatabase systems in to solve the issue of sharing all the information in these pre existing databases by preserving the investment in the building of these databases. 互联网络上的多数据库系统由联结在网络上的先期存在的多个高度自治的异构数据库组成。
A hive cannot exist without a queen. 蜂房不可无蜂王。
They seem to exist on a different spiritual plane. 他们似乎生活在不同的精神境界。
We can not exist without food or water. 没有食物和水我们不能生存。
Matter can exist as a solid, liquid, or gas. 物体存在的形态有固体，液体，气体。
We cannot exist without food or water. 没有食物或水我们就不能生存。
