若非一条eSCO信谈非复向的，例如语音博物馆向导(audio museum guide)，接管止静措施在领受到一个数据包后回发一个很小的叫做NULL的包以暗示确认。
基于16个网页-相关网页
MUSEUM OF ACROPOLIS AUDIO GUIDE 雅典卫城博物馆语音导赏
audio museum guide
博物馆语音导览
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That day, as a cold wind buffeted the windows, dozens of visitors wandered through the museum's quiet chapels and arcades, many listening to an audio guide on iPods that the museum adopted last year.
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Audio pieces -- like the ones you might expect to find in a museum guide which guide you through paths on seven different trails.
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