说明：  本书全面介绍了IDL的基础只是和应用编程技巧。初级者可以掌握IDL的基础语法，中高级读者可以学会如何编写易于理解而又高校的IDL程序。
(This book gave a comprehensive account of the basis of IDL programming techniques and applications only. Primary will be able to grasp the basis of IDL grammar, middle and senior readers can learn how to prepare easy-to-understand IDL procedures and institutions of higher learning.)