fix

app/Transformer/Book/BookTransformer.php

@@ -62,6 +62,7 @@ class BookTransformer
                 'audio_effect_status'   => getProp($item, 'audio_effect_status'),
                 'bgm_status'            => getProp($item, 'bgm_status'),
                 'remark'                => getProp($item, 'remark'),
+                'complete_audio_url'    => getProp($item, 'complete_audio_url'),
                 'subtitle_info'         => $subtitle_info
             ];
         }