你指的是什么事情？
这已不是蔡某首次伸出肮脏之手。[{'character': '这', 'pinyin': 'zhe4', 'highest pitch': 11.04, 'lowest pitch': 9.02, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '已', 'pinyin': 'i3', 'highest pitch': 9.02, 'lowest pitch': 5.79, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '不', 'pinyin': 'bu2', 'highest pitch': 8.92, 'lowest pitch': 7.76, 'duration': 0.11, 'prosody hierarchy': 'null'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 10.56, 'lowest pitch': 8.87, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '蔡', 'pinyin': 'cai4', 'highest pitch': 10.27, 'lowest pitch': 7.97, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '某', 'pinyin': 'mou2', 'highest pitch': 8.25, 'lowest pitch': 6.19, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'character': '首', 'pinyin': 'shou3', 'highest pitch': 13.59, 'lowest pitch': 5.82, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '次', 'pinyin': 'cii4', 'highest pitch': 10.94, 'lowest pitch': 5.82, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '伸', 'pinyin': 'shen1', 'highest pitch': 9.82, 'lowest pitch': 8.04, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '出', 'pinyin': 'chu1', 'highest pitch': 9.02, 'lowest pitch': 8.04, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '肮', 'pinyin': 'ang1', 'highest pitch': 10.12, 'lowest pitch': 9.38, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '脏', 'pinyin': 'zang1', 'highest pitch': 10.85, 'lowest pitch': 10.25, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '之', 'pinyin': 'zhiii1', 'highest pitch': 9.11, 'lowest pitch': 7.02, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '手', 'pinyin': 'shou3', 'highest pitch': 13.59, 'lowest pitch': 4.83, 'duration': 0.28, 'prosody hierarchy': '#4'}]