这是怎么回事？
阅览室里人头攒动，但鸦雀无声。[{'character': '阅', 'pinyin': 've4', 'highest pitch': 11.35, 'lowest pitch': 10.17, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '览', 'pinyin': 'lan3', 'highest pitch': 10.99, 'lowest pitch': 7.11, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '室', 'pinyin': 'shiii4', 'highest pitch': 9.37, 'lowest pitch': 7.8, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '里', 'pinyin': 'li3', 'highest pitch': 8.52, 'lowest pitch': 5.55, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '人', 'pinyin': 'ren2', 'highest pitch': 8.87, 'lowest pitch': 6.7, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '头', 'pinyin': 'tou2', 'highest pitch': 8.87, 'lowest pitch': 7.21, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '攒', 'pinyin': 'cuan2', 'highest pitch': 8.05, 'lowest pitch': 5.55, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '动', 'pinyin': 'dong4', 'highest pitch': 9.87, 'lowest pitch': 6.7, 'duration': 0.25, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.1}, {'character': '但', 'pinyin': 'dan4', 'highest pitch': 7.11, 'lowest pitch': 6.08, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '鸦', 'pinyin': 'ia1', 'highest pitch': 9.11, 'lowest pitch': 6.08, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '雀', 'pinyin': 'qve4', 'highest pitch': 9.25, 'lowest pitch': 6.5, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '无', 'pinyin': 'u2', 'highest pitch': 7.22, 'lowest pitch': 6.02, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '声', 'pinyin': 'sheng1', 'highest pitch': 9.32, 'lowest pitch': 8.42, 'duration': 0.31, 'prosody hierarchy': '#4'}]