例句與造句

1. we first present a number of desiderata for an xml-based query language, and based on this criterion, we introduce the syntax of a simple core ian-guage for semistructured data and then describe four extensions that have resulted in working prototypes . second, we present the algorithm for computing the result of a regular expression on data graph with cycles, the first-order interpretation of querying language for semistructured data, and explore structural recursion and bisimulation in semistructured data and propose an efficient and systematic way to computing a bisimulation between the two graphs . we also proposed and implemented a web querying system with database features
   基于這些準則，對一個簡單的半結構數據查詢核心語言的語法提出了兩方面擴充；給出了計算數據圖中正規(guī)表達式的算法；對半結構數據查詢語言的一階邏輯描述、結構遞歸和數據圖的雙態(tài)仿真(bisimulation)等問題進行了研究，提出了一種判定數據圖的bisimulation算法；在xml數據查詢語言研究的基礎上，設計并實現(xiàn)了一種具有數據庫查詢特性的web查詢系統(tǒng)原型。
2. It's difficult to find structural recursion in a sentence. 用structural recursion造句挺難的