pre-existent

基本解釋

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.
互聯(lián)網(wǎng)絡(luò)上的多數(shù)據(jù)庫(kù)系統(tǒng)由聯(lián)結(jié)在網(wǎng)絡(luò)上的先期存在的多個(gè)高度自治的異構(gòu)數(shù)據(jù)庫(kù)組成。
pre existent
adj. 先在的
A hive cannot exist without a queen.
蜂房不可無(wú)蜂王。
They seem to exist on a different spiritual plane.
他們似乎生活在不同的精神境界。
We can not exist without food or water.
沒有食物和水我們不能生存。