求翻译：　　实时嵌入式系统是嵌入式系统的一种，它能够对外部事件给予及时响应。对外部事件的响应有三个步骤：对外部事件的识别，必要的处理，以及结果的输出。实时系统又分为硬实时和软实时两种。在软实时系统中，系统的宗旨是使各个任务运行得越快越好，对响应时间的介定有一定的灵活性；在硬实时系统中，各任务不仅要执行无误而且要做到准时，一旦不能在确定的时间内完成,有可能导致灾难性后果。实时操作系统（RTOS）以及时的方式进行任务调度、系统资源的管理以及为应用开发提供一个稳固的平台。RTOS可以是一个小而简单的系统，也可以是一个大而全的系统，具体要视实际应用而定.目前流行的许多RTOS都是用户可裁剪定制的,如vxworks和pSOS等。是什么意思？

　　Is a type of embedded systems for real-time embedded systems, it is able to give a timely response to external events. Response to external events in three steps: the recognition of external events, the necessary processing and output of the results. Real-time is divided into hard and soft real-time systems both in real time. In soft real-time systems, the system's purpose is to make individual tasks run faster, the better, between a certain degree of flexibility to the response time; in a hard real-time system, the task not only to implement the correct but to do so on time, once cannot be completed within the established time, could lead to disastrous consequences. Real time operating system (RTOS) and time of task scheduling, system resource management, and provides a solid platform for application development. RTOS can be a small, simple systems, systems that can also be a large, concrete depending on the actual application dependent. many RTOS are currently popular users can crop a custom, such as VxWorks and pSOS, etc.