这个线的质量好差啊。
黑棉线粗糙无弹性，揉搓后会大量脱落纤维，易断。[{'character': '黑', 'pinyin': 'hei1', 'highest pitch': 11.28, 'lowest pitch': 10.99, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '棉', 'pinyin': 'mian2', 'highest pitch': 11.01, 'lowest pitch': 7.37, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '线', 'pinyin': 'xian4', 'highest pitch': 9.44, 'lowest pitch': 7.6, 'duration': 0.28, 'prosody hierarchy': '#2'}, {'character': '粗', 'pinyin': 'cu1', 'highest pitch': 9.59, 'lowest pitch': 7.62, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '糙', 'pinyin': 'cao1', 'highest pitch': 9.79, 'lowest pitch': 9.16, 'duration': 0.29, 'prosody hierarchy': '#1'}, {'character': '无', 'pinyin': 'u2', 'highest pitch': 9.78, 'lowest pitch': 7.71, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '弹', 'pinyin': 'tan2', 'highest pitch': 7.66, 'lowest pitch': 5.4, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '性', 'pinyin': 'xing4', 'highest pitch': 10.22, 'lowest pitch': 7.27, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.31}, {'character': '揉', 'pinyin': 'rou2', 'highest pitch': 6.95, 'lowest pitch': 6.59, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '搓', 'pinyin': 'cuo1', 'highest pitch': 9.01, 'lowest pitch': 6.94, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '后', 'pinyin': 'hou4', 'highest pitch': 8.67, 'lowest pitch': 6.48, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.2}, {'character': '会', 'pinyin': 'huei4', 'highest pitch': 11.16, 'lowest pitch': 8.76, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '大', 'pinyin': 'da4', 'highest pitch': 10.91, 'lowest pitch': 9.19, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '量', 'pinyin': 'liang4', 'highest pitch': 9.19, 'lowest pitch': 7.48, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '脱', 'pinyin': 'tuo1', 'highest pitch': 9.34, 'lowest pitch': 7.48, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '落', 'pinyin': 'luo4', 'highest pitch': 8.8, 'lowest pitch': 7.26, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '纤', 'pinyin': 'xian1', 'highest pitch': 9.53, 'lowest pitch': 7.37, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '维', 'pinyin': 'uei2', 'highest pitch': 9.01, 'lowest pitch': 5.84, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.09}, {'character': '易', 'pinyin': 'i4', 'highest pitch': 9.31, 'lowest pitch': 7.9, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '断', 'pinyin': 'duan4', 'highest pitch': 10.88, 'lowest pitch': 6.67, 'duration': 0.29, 'prosody hierarchy': '#4'}]