A sink of anything (at least in the information world) is a
destination. So a telephone handset is an audio sink (the earpiece,
anyway - the microphone would be a source).
sink, 是一个目的。因此，电话的耳机，是一个 andio sink（听筒，无论如何，mic会是一个audio 源），
A Bluetooth headset is an audio sink. A hands free kit is an audio sink. [on the earpiece/speaker sides, at least].
蓝牙耳机是一个 audio sink。免提是一个audio sink。
A gateway is a translation, mapping or [re]director (or some mixture of the three) point in a network.
网关是网络中的一个翻译，映射或者定向（重定向）（或者三者混合）的点。
A cell phone with a bluetooth interface (capable of supporting a headset, for instance) is an audio gateway. It takes a GSM signal and formats it suitably for Bluetooth (translation) and provides the connection control to the headset (mapping and redirect).
带有蓝牙接口（例如，支持耳机）的电话，是一个 audio 网关。它拿到GSM信号，并为蓝牙进行适当的格式化（翻译），并为耳机提供链接控制（映射和重定向）。
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