是的，这确实是一个普遍存在的问题。
买家和卖家同样面临着举证维权困难的窘境。[{'character': '买', 'pinyin': 'mai3', 'highest pitch': 8.78, 'lowest pitch': 6.82, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '家', 'pinyin': 'jia1', 'highest pitch': 10.36, 'lowest pitch': 6.82, 'duration': 0.27, 'prosody hierarchy': '#2'}, {'character': '和', 'pinyin': 'he2', 'highest pitch': 10.3, 'lowest pitch': 7.99, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '卖', 'pinyin': 'mai4', 'highest pitch': 11.11, 'lowest pitch': 7.35, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '家', 'pinyin': 'jia1', 'highest pitch': 10.36, 'lowest pitch': 7.35, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.07}, {'character': '同', 'pinyin': 'tong2', 'highest pitch': 9.65, 'lowest pitch': 7.37, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '样', 'pinyin': 'iang4', 'highest pitch': 11.3, 'lowest pitch': 9.65, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '面', 'pinyin': 'mian4', 'highest pitch': 9.78, 'lowest pitch': 7.69, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '临', 'pinyin': 'lin2', 'highest pitch': 7.69, 'lowest pitch': 6.36, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '着', 'pinyin': 'zhe5', 'highest pitch': 13.18, 'lowest pitch': 7.28, 'duration': 0.16, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.04}, {'character': '举', 'pinyin': 'jv3', 'highest pitch': 7.9, 'lowest pitch': 6.58, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '证', 'pinyin': 'zheng4', 'highest pitch': 10.08, 'lowest pitch': 6.58, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '维', 'pinyin': 'uei2', 'highest pitch': 10.1, 'lowest pitch': 7.06, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '权', 'pinyin': 'qvan2', 'highest pitch': 9.84, 'lowest pitch': 6.85, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '困', 'pinyin': 'kuen4', 'highest pitch': 9.52, 'lowest pitch': 7.21, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '难', 'pinyin': 'nan2', 'highest pitch': 7.21, 'lowest pitch': 6.02, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.16, 'lowest pitch': 6.02, 'duration': 0.1, 'prosody hierarchy': '#1'}, {'character': '窘', 'pinyin': 'jiong3', 'highest pitch': 8.41, 'lowest pitch': 5.7, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '境', 'pinyin': 'jing4', 'highest pitch': 8.48, 'lowest pitch': 5.84, 'duration': 0.3, 'prosody hierarchy': '#4'}]