解决达尔富尔问题的困难在于
解决达尔富尔问题目前的困难何在？[{'character': '解', 'pinyin': 'jie3', 'highest pitch': 8.82, 'lowest pitch': 7.15, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '决', 'pinyin': 'jve2', 'highest pitch': 8.98, 'lowest pitch': 7.15, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'character': '达', 'pinyin': 'da2', 'highest pitch': 10.0, 'lowest pitch': 7.56, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '尔', 'pinyin': 'er3', 'highest pitch': 10.49, 'lowest pitch': 6.04, 'duration': 0.22, 'prosody hierarchy': '#1'}, {'character': '富', 'pinyin': 'fu4', 'highest pitch': 10.84, 'lowest pitch': 6.04, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '尔', 'pinyin': 'er3', 'highest pitch': 10.49, 'lowest pitch': 4.93, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '问', 'pinyin': 'uen4', 'highest pitch': 7.54, 'lowest pitch': 6.19, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '题', 'pinyin': 'ti5', 'highest pitch': 6.54, 'lowest pitch': 5.31, 'duration': 0.29, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.14}, {'character': '目', 'pinyin': 'mu4', 'highest pitch': 10.19, 'lowest pitch': 9.34, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '前', 'pinyin': 'qian2', 'highest pitch': 8.53, 'lowest pitch': 6.72, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.29, 'lowest pitch': 7.7, 'duration': 0.08, 'prosody hierarchy': '#1'}, {'character': '困', 'pinyin': 'kuen4', 'highest pitch': 9.54, 'lowest pitch': 7.28, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '难', 'pinyin': 'nan2', 'highest pitch': 7.9, 'lowest pitch': 6.34, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '何', 'pinyin': 'he2', 'highest pitch': 7.73, 'lowest pitch': 5.46, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '在', 'pinyin': 'zai4', 'highest pitch': 9.46, 'lowest pitch': 6.29, 'duration': 0.29, 'prosody hierarchy': '#4'}]