Take a book database as an example and built up its complicated switch model.

以一个简单的图书数据库，建立其复杂开关模型，例证说明，可使图书查询结果较精。

youdao

Take a book database as an example and built up its complicated switch model.

以一个简单的图书数据库，建立其复杂开关模型，例证说明，可使图书查询结果较精。

youdao