Throughout the book there will be concrete examples on developing most of the component types introduced here. 在本书中将有大部分使用这里介绍过的组件类型来开发的具体例子。
Operator theory, like every other part of mathematics, cannot be properly studied without a large stock of concrete examples. 算子理论如同数学的每一其它部分，如果没有大量具体例子作为储备，就不能真正地进行理论考察和研究。
