question-answering system的用法和样例：
例句
- A knowledge base with self-contained functions and knowledge can consumedly improve efficiency and accuracy of a question answering system.
一个功能和知识完备的知识库能够大大提高问答系统的效率与准确率。 - Question classification is the first task of Question Answering System, and the precision of question classification has great effect on the subsequent processes.
问题分类是问答系统所要处理的第一步，分类结果的正确率直接影响后续工作的进行。
