space database的用法和樣例：
例句
- Selectivity Estimation is the base of spatial database query optimizer.
選擇性估計是設計空間數據庫查詢(xún)優(yōu)化器的基礎。 - Several examples are demonstrated to discuss the representing and querying ability of the new model and its database extension.
實(shí)例研究表明該模型及其數據庫擴展很好表達時(shí)空現象并支持場(chǎng)數據的空間數據庫管理和時(shí)空查詢(xún)。
