业务状态机是事件驱动的业务事务，该业务事务定义了应用软件中给定部分的一组状态。

A business state machine is an event-driven business transaction that defines a set of states for a given part of the application.

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用这个方式，很多数据可以作离机贮存，需要时，把磁碟组放入磁碟驱动器内。

In this manner, a great amount of data can be stored off-line and mounted on the disc drive when needed.

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介绍了ULN2003的特点与电路结构，采用单片机连接uln2003组成的驱动系统来驱动步进电机。

The paper describes the characteristics and circuit of ULN2003, and designs the system of motor drive using the microcomputer combined with the ULN2003 to drive the stepper motor.

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