Task: Sentence Expansion
Input (English): WAV ( or WAVE ) , short for Waveform Audio File Format , is a Microsoft and IBM audio file format standard for storing an audio bitstream on PCs .
Output (English): Waveform Audio File Format ( WAVE , or more commonly known as WAV due to its filename extension ; pronounced " wave " or ) is an audio file format standard , developed by Microsoft and IBM , for storing an audio bitstream on PCs .