这样，原语(自定义或预置)就能够以统一的方式访问消息，而不受用于发送消息的协议的影响。
This enables primitives (custom or pre-built) to access the message in a uniform way, regardless of the protocol that was used to send it.
复杂的功能可以被激活或通过预置功能集或手动方式取消。
Complex features can be activated or de-activated by means of pre-set feature sets or manually.
常见的方式有压力切换、容量切换、时间切换和流速切换，即吸气达到预置的压力、容量、时间或流速则转为呼气。
Common form of the pressure switch, volume switch, time switch and flow switch, that is, to achieve the preset inspiratory pressure, capacity, time or flow rate is converted to breath.
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