多数事件驱动的系统依赖于预先构建的事件队列技术，如面向消息的中间件(Message - Oriented Middleware, MOM)框架。

Most event-driven systems rely on prebuilt event queue technologies, such as a Message-Oriented Middleware (MOM) framework.

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在面向对象的系统中，当一个对象接收到一条消息时，可能会发生一系列的事件。

In an object-oriented system, when an object receives a message, it can fire off a set of events.

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SP语言是可移植、强类型、面向事件的离散系统模拟语言，是以PASCAL语言为基础进行模拟功能扩充而形成的。

SP is a portable, strongly-typed, event-oriented, discrete system simulation language, It is derived from PASCAL by adding some simulation functions.

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