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请问，A 真的是 B 的原因吗？", "category": "PLAIN_TEXT", "created_at": "2023-06-07T01:53:22.476357Z", "speaker": null, "group_id": "7000102069" }, { "course_id": 7787, "message_id": "a3f8f556-cd9a-4cd0-846d-42751cdb1e06", "index": 0, "user_id": "b76e0418-2d94-4b36-a6dd-497933b79923", "quote_message_id": "", "text": "", "category": "PLAIN_AUDIO", "created_at": "2023-06-07T01:54:10.150504Z", "attachment": { "id": "caed872e-c8eb-4160-84c0-59d0b48b428e", "category": "course", "size": 340269, "mime_type": "audio/mp3", "name": "caed872e-c8eb-4160-84c0-59d0b48b428e.mp3", "duration": 42490, "waveform": "ElMCKC8tHQgTBAYCBBgAAhIIAl8LUw0bGg0KHTsHKE88G1UnBg43EWUWBj5CPA8GAUwuPz0KHwk6FFADCwgC", "location": "aws_s3", "url": "https://xuexi-courses-storage.firesbox.com/7000102069/replay/caed872e-c8eb-4160-84c0-59d0b48b428e.mp3", "group_id": "7000102069" }, "speaker": null, "group_id": "7000102069" }, { "course_id": 7787, "message_id": "fa32fd75-b9bd-429b-81a0-657f60a92865", "index": 0, "user_id": "b76e0418-2d94-4b36-a6dd-497933b79923", "quote_message_id": "", "text": "2. 如果 A 的确是 B 的原因，那么请问，A 是 B 的唯一原因吗？", "category": "PLAIN_TEXT", "created_at": "2023-06-07T01:54:21.904128Z", "speaker": null, "group_id": "7000102069" }, { "course_id": 7787, "message_id": "408afbbb-9b63-45fa-b058-04c3acefa91e", "index": 0, "user_id": "b76e0418-2d94-4b36-a6dd-497933b79923", "quote_message_id": "", "text": "", "category": "PLAIN_AUDIO", "created_at": "2023-06-07T01:55:10.935841Z", "attachment": { "id": "8ac8fe66-96f7-4dcc-a89c-f534377a9fc0", "category": "course", "size": 336045, "mime_type": "audio/mp3", "name": "8ac8fe66-96f7-4dcc-a89c-f534377a9fc0.mp3", "duration": 41962, "waveform": "CAF/Q0cTCBZ0aghYLgFEKSQSDERnPlEKMAInIgJEFRcoCF8dAy8WFwYXBFtnLxcaNisJKAIEOQhSIkAvEgcI", "location": "aws_s3", "url": "https://xuexi-courses-storage.firesbox.com/7000102069/replay/8ac8fe66-96f7-4dcc-a89c-f534377a9fc0.mp3", "group_id": "7000102069" }, "speaker": null, "group_id": "7000102069" }, { "course_id": 7787, 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