该系统包括一对设备——光学数据发送器和接收器。
The system consists of a device pair - optical data sender and receiver.
如果您在消息体中使用XML进行数据交换，最佳实践建议您执行XML Schema (XSD)验证，以确保发送器和接收器使用相同的语言。
If you use XML for data exchange in the message body, best practices recommend that you perform XML Schema (XSD) validation to ensure that the sender and receiver speak the same language.
由于数据必须在两个方向上流通，所以发送器和接收器都要使用。
Data must pass in both directions so both transmitters and receivers are used.
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