Delete row 263 from pager_reading_material_paragraphs

id 263
material_id mat_4e7c6d11
paragraph_index 4
paragraph_text 第五天晚上宿营时，刚过后半夜，老钱就起来烧开水。我担心他的身体，转过夜，铜锅又被另一个炊事员挑着前进 ...
create_time 2026-06-16 13:59:33
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