说明：  此书首先介绍了嵌入式系统，然后谈及他的特征和优势，以及构造嵌入式系统的关键问题和步骤，最后介绍了一种嵌入式linux操作系统pocket IX
( This book first introduced inserts the type system, then refers to his characteristic and the superiority, as well as the structure inserts the type system the key question and the step, finally introduced one kind inserts type linux operating system pocket IX )