我们需要进行详细的调查研究。
这为日后发表的统计数字所印证。[{'character': '这', 'pinyin': 'zhe4', 'highest pitch': 10.21, 'lowest pitch': 9.24, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '为', 'pinyin': 'uei4', 'highest pitch': 9.35, 'lowest pitch': 8.51, 'duration': 0.24, 'prosody hierarchy': '#2'}, {'character': '日', 'pinyin': 'riii4', 'highest pitch': 10.28, 'lowest pitch': 8.51, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '后', 'pinyin': 'hou4', 'highest pitch': 9.27, 'lowest pitch': 8.26, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '发', 'pinyin': 'fa1', 'highest pitch': 10.05, 'lowest pitch': 8.28, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '表', 'pinyin': 'biao3', 'highest pitch': 9.21, 'lowest pitch': 5.36, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.87, 'lowest pitch': 5.36, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '统', 'pinyin': 'tong3', 'highest pitch': 7.89, 'lowest pitch': 5.3, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '计', 'pinyin': 'ji4', 'highest pitch': 9.65, 'lowest pitch': 5.81, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '数', 'pinyin': 'shu4', 'highest pitch': 10.82, 'lowest pitch': 8.73, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '字', 'pinyin': 'zii4', 'highest pitch': 9.55, 'lowest pitch': 8.07, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '所', 'pinyin': 'suo3', 'highest pitch': 6.61, 'lowest pitch': 4.68, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '印', 'pinyin': 'in4', 'highest pitch': 10.1, 'lowest pitch': 6.23, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '证', 'pinyin': 'zheng4', 'highest pitch': 8.7, 'lowest pitch': 5.19, 'duration': 0.28, 'prosody hierarchy': '#4'}]