question-answering system的用法和樣例：
例句
- A knowledge base with self-contained functions and knowledge can consumedly improve efficiency and accuracy of a question answering system.
一個功能和知識完備的知識庫能夠大大提高問答系統的效率與準確率。 - Question classification is the first task of Question Answering System, and the precision of question classification has great effect on the subsequent processes.
問題分類是問答系統所要處理的第一步，分類結果的正確率直接影響後續工作的進行。
