例句與造句

1. First , in this paper , a paraconsistent relational data model and its algebraic operators are introduced briefly . then , paraconsistent relational calculus based on this model is discussed and domain relational calculus for paraconsistent database is presented
   本文首先簡(jiǎn)要介紹了次協(xié)調(diào)關(guān)系數(shù)據(jù)模型及其代數(shù)運(yùn)算,并在此基礎(chǔ)上進(jìn)一步討論了次協(xié)調(diào)關(guān)系演算,提出了次協(xié)調(diào)關(guān)系上的域關(guān)系演算。
2. It's difficult to find relational calculus in a sentence. 用relational calculus造句挺難的