文帝在什么时候去世的？
公元前一百五十七年，文帝先于薄太后离开人世。[{'character': '公', 'pinyin': 'gong1', 'highest pitch': 11.02, 'lowest pitch': 10.49, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '元', 'pinyin': 'van2', 'highest pitch': 10.57, 'lowest pitch': 8.75, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '前', 'pinyin': 'qian2', 'highest pitch': 9.48, 'lowest pitch': 6.93, 'duration': 0.28, 'prosody hierarchy': '#2'}, {'character': '一', 'pinyin': 'i4', 'highest pitch': 8.7, 'lowest pitch': 7.14, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '百', 'pinyin': 'bai2', 'highest pitch': 8.23, 'lowest pitch': 7.1, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '五', 'pinyin': 'u3', 'highest pitch': 8.14, 'lowest pitch': 5.64, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '十', 'pinyin': 'shiii5', 'highest pitch': 6.74, 'lowest pitch': 5.76, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '七', 'pinyin': 'qi1', 'highest pitch': 9.03, 'lowest pitch': 6.74, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '年', 'pinyin': 'nian2', 'highest pitch': 9.03, 'lowest pitch': 5.21, 'duration': 0.34, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.28}, {'character': '文', 'pinyin': 'uen2', 'highest pitch': 9.12, 'lowest pitch': 6.87, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '帝', 'pinyin': 'di4', 'highest pitch': 10.48, 'lowest pitch': 8.46, 'duration': 0.23, 'prosody hierarchy': '#2'}, {'character': '先', 'pinyin': 'xian1', 'highest pitch': 9.68, 'lowest pitch': 8.45, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '于', 'pinyin': 'v2', 'highest pitch': 8.74, 'lowest pitch': 7.86, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '薄', 'pinyin': 'bo2', 'highest pitch': 8.22, 'lowest pitch': 6.34, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '太', 'pinyin': 'tai4', 'highest pitch': 10.09, 'lowest pitch': 8.01, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '后', 'pinyin': 'hou4', 'highest pitch': 13.85, 'lowest pitch': 7.34, 'duration': 0.23, 'prosody hierarchy': '#2'}, {'character': '离', 'pinyin': 'li2', 'highest pitch': 13.35, 'lowest pitch': 6.33, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '开', 'pinyin': 'kai1', 'highest pitch': 8.42, 'lowest pitch': 7.48, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '人', 'pinyin': 'ren2', 'highest pitch': 7.56, 'lowest pitch': 5.56, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '世', 'pinyin': 'shiii4', 'highest pitch': 8.11, 'lowest pitch': 6.11, 'duration': 0.26, 'prosody hierarchy': '#4'}]