例句與造句

1. The database theory starts for 1960s , and come through hierarchical model database system , network model database system , and relational model database system
   數(shù)據(jù)庫技術(shù)始于20世紀60年代,幾十年來,數(shù)據(jù)庫技術(shù)的發(fā)展經(jīng)歷了由層次數(shù)據(jù)庫系統(tǒng)、網(wǎng)狀數(shù)據(jù)庫系統(tǒng),到關(guān)系數(shù)據(jù)庫系統(tǒng)。
2. It's difficult to find hierarchical model database system in a sentence. 用hierarchical model database system造句挺難的