Bluetooth Technology is a kind of open specification for wireless data and voice, it is basic on low cost short-range radio link, and it can build a wireless link for immobile and mobile device.

蓝牙技术是一种无线数据与语音通信的开放性规范，它以低成本的近距离无线连接为基础，为固定与移动设备通信环境建立一种无线连接。

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Bluetooth Technology is a kind of open specification for wireless data and voice. It bases on low cost short -range radio link, and it can build a wireless link for fixed and mobile device.

蓝牙技术是一种无线数据与语音通信的开放性规范，它以低成本的近距离无线连接为基础，为固定与移动设备通信环境建立一种无线连接。

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In wireless packet networks, because we need radio to receive or send data, so a basic problem is how to attach radio protocol to DTE's data link layer and assure communication running well.

无线分组网中，由于需要利用电台收发数据，于是在DTE的数据链路层中加入电台协议，保证DTE与电台的通信正常进行是需要解决的基本问题。

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Not all planes across oceans have data-link capabilities, and high-frequency radio is still used with some flights and as a backup with others.

WSJ: How New Air-Traffic Control Systems Operate Over Oceans