你见过这样的现象吗？
考古专家感到“挠头”。[{'character': '考', 'pinyin': 'kao2', 'highest pitch': 9.58, 'lowest pitch': 8.06, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '古', 'pinyin': 'gu3', 'highest pitch': 8.85, 'lowest pitch': 7.07, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '专', 'pinyin': 'zhuan1', 'highest pitch': 8.9, 'lowest pitch': 7.07, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '家', 'pinyin': 'jia1', 'highest pitch': 9.49, 'lowest pitch': 8.24, 'duration': 0.24, 'prosody hierarchy': '#1'}, {'character': '感', 'pinyin': 'gan3', 'highest pitch': 9.07, 'lowest pitch': 5.7, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '到', 'pinyin': 'dao4', 'highest pitch': 7.36, 'lowest pitch': 5.86, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '挠', 'pinyin': 'nao2', 'highest pitch': 8.63, 'lowest pitch': 5.92, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '头', 'pinyin': 'tou2', 'highest pitch': 8.16, 'lowest pitch': 5.83, 'duration': 0.39, 'prosody hierarchy': '#4'}]