A: 发生了什么事情？
后方某先后被两辆轿车碾压致死。[{'character': '后', 'pinyin': 'hou4', 'highest pitch': 12.88, 'lowest pitch': 9.25, 'duration': 0.3, 'prosody hierarchy': '#2'}, {'character': '方', 'pinyin': 'fang1', 'highest pitch': 12.88, 'lowest pitch': 10.83, 'duration': 0.29, 'prosody hierarchy': 'null'}, {'character': '某', 'pinyin': 'mou3', 'highest pitch': 10.83, 'lowest pitch': 6.65, 'duration': 0.22, 'prosody hierarchy': '#2'}, {'character': '先', 'pinyin': 'xian1', 'highest pitch': 9.76, 'lowest pitch': 9.13, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '后', 'pinyin': 'hou4', 'highest pitch': 12.88, 'lowest pitch': 7.15, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '被', 'pinyin': 'bei4', 'highest pitch': 8.57, 'lowest pitch': 7.15, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '两', 'pinyin': 'liang3', 'highest pitch': 7.38, 'lowest pitch': 4.31, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '辆', 'pinyin': 'liang4', 'highest pitch': 10.2, 'lowest pitch': 4.99, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '轿', 'pinyin': 'jiao4', 'highest pitch': 9.73, 'lowest pitch': 6.85, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '车', 'pinyin': 'che1', 'highest pitch': 8.81, 'lowest pitch': 6.85, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '碾', 'pinyin': 'nian3', 'highest pitch': 8.29, 'lowest pitch': 4.9, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '压', 'pinyin': 'ia1', 'highest pitch': 7.42, 'lowest pitch': 4.91, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '致', 'pinyin': 'zhiii4', 'highest pitch': 8.45, 'lowest pitch': 7.25, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '死', 'pinyin': 'sii3', 'highest pitch': 5.35, 'lowest pitch': 4.11, 'duration': 0.35, 'prosody hierarchy': '#4'}]