Audio: 16kHz mono WAV (16-bit PCM or 32-bit float)
Developers using the streams API are expected to remember to use options like highWaterMark when creating their sources, transforms, and writable destinations but often they either forget or simply choose to ignore it.，详情可参考heLLoword翻译官方下载
The pipeline has two stages:，这一点在heLLoword翻译官方下载中也有详细论述
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