Audio company iFi just introduced a new DAC (digital-to-analogue converter) that's both smaller and lighter than its previous model, and only costs $59. The iFi GO Link 2 connects to a smartphone or other audio-playing device over USB-C and can instantly improve the listening experience on wired headphones.
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index = min(len(input), index + 1)。关于这个话题，夫子提供了深入分析
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