怎么这么快就用完了？
刘瑜同学看到，黑板槽里那寥寥无几的粉笔头，很快消耗一空。[{'character': '刘', 'pinyin': 'liou2', 'highest pitch': 11.09, 'lowest pitch': 8.38, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '瑜', 'pinyin': 'v2', 'highest pitch': 10.28, 'lowest pitch': 9.57, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '同', 'pinyin': 'tong2', 'highest pitch': 9.37, 'lowest pitch': 7.98, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '学', 'pinyin': 'xve2', 'highest pitch': 8.54, 'lowest pitch': 7.54, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '看', 'pinyin': 'kan4', 'highest pitch': 9.85, 'lowest pitch': 7.12, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '到', 'pinyin': 'dao4', 'highest pitch': 7.35, 'lowest pitch': 4.91, 'duration': 0.22, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.4}, {'character': '黑', 'pinyin': 'hei1', 'highest pitch': 11.38, 'lowest pitch': 10.75, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '板', 'pinyin': 'ban3', 'highest pitch': 11.02, 'lowest pitch': 6.46, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '槽', 'pinyin': 'cao2', 'highest pitch': 8.37, 'lowest pitch': 6.68, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '里', 'pinyin': 'li3', 'highest pitch': 8.69, 'lowest pitch': 5.69, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.06}, {'character': '那', 'pinyin': 'na4', 'highest pitch': 8.5, 'lowest pitch': 7.39, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '寥', 'pinyin': 'liao2', 'highest pitch': 10.34, 'lowest pitch': 7.39, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '寥', 'pinyin': 'liao2', 'highest pitch': 10.34, 'lowest pitch': 8.43, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '无', 'pinyin': 'u2', 'highest pitch': 10.12, 'lowest pitch': 8.27, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '几', 'pinyin': 'ji3', 'highest pitch': 8.12, 'lowest pitch': 5.76, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.51, 'lowest pitch': 5.8, 'duration': 0.11, 'prosody hierarchy': '#1'}, {'character': '粉', 'pinyin': 'fen2', 'highest pitch': 9.24, 'lowest pitch': 6.4, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '笔', 'pinyin': 'bi3', 'highest pitch': 9.24, 'lowest pitch': 5.83, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '头', 'pinyin': 'tou2', 'highest pitch': 7.85, 'lowest pitch': 6.1, 'duration': 0.36, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.34}, {'character': '很', 'pinyin': 'hen3', 'highest pitch': 8.79, 'lowest pitch': 5.94, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '快', 'pinyin': 'kuai4', 'highest pitch': 11.03, 'lowest pitch': 7.88, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '消', 'pinyin': 'xiao1', 'highest pitch': 9.06, 'lowest pitch': 7.88, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '耗', 'pinyin': 'hao4', 'highest pitch': 9.72, 'lowest pitch': 7.39, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '一', 'pinyin': 'i4', 'highest pitch': 7.39, 'lowest pitch': 5.71, 'duration': 0.12, 'prosody hierarchy': 'null'}, {'character': '空', 'pinyin': 'kong1', 'highest pitch': 8.3, 'lowest pitch': 7.69, 'duration': 0.34, 'prosody hierarchy': '#4'}]