The abstract should be clear, descriptive and not longer than 400 words. 抽象應該是明確的，敘述性的， 最長不超過400字。
First of all, a descriptive analysis of statistic features of abstract expressions is required. 第五章對語料庫檢索所得數(shù)據(jù)進行了分析和討論。
The establishment of the model has raised the abstract level of the UI design and improved the descriptive capability of the model. 此模型的建立提高了界面設計的抽象層次，增強了模型的描述能力以及軟件的復用性。