There is a minor artefact in the final file. The stitched .m4a sometimes contains silent padding at the start or end from incomplete chunks at buffer boundaries. A quick ffmpeg pass fixes it cleanly:
一辆辆车来，一辆辆车走。车上拉的都是灯。
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The data shows that confusable risk is not a property of character pairs alone. It is a property of character pairs in a specific font. That has direct consequences for anyone building on the web.，详情可参考爱思助手下载最新版本
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