Delete row 9 from textbook_texts

id 9
lesson_id 23
content 铃声响，下课了。\n操场上，真热闹。\n跳绳踢毽丢沙包，\n天天锻炼身体好。
paragraphs ["铃声响，下课了。", "操场上，真热闹。", "跳绳踢毽 ...
word_count 24
created_at 2026-06-18 03:50:39
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