这是怎么回事？
院子南墙上可见一处熏黑的烟囱。[{'character': '院', 'pinyin': 'van4', 'highest pitch': 10.79, 'lowest pitch': 8.87, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '子', 'pinyin': 'zii5', 'highest pitch': 8.87, 'lowest pitch': 7.5, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '南', 'pinyin': 'nan2', 'highest pitch': 10.76, 'lowest pitch': 7.07, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '墙', 'pinyin': 'qiang2', 'highest pitch': 10.76, 'lowest pitch': 5.76, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '上', 'pinyin': 'shang4', 'highest pitch': 10.14, 'lowest pitch': 7.59, 'duration': 0.3, 'prosody hierarchy': '#2'}, {'character': '可', 'pinyin': 'ke3', 'highest pitch': 7.85, 'lowest pitch': 6.06, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '见', 'pinyin': 'jian4', 'highest pitch': 8.18, 'lowest pitch': 6.06, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '一', 'pinyin': 'i2', 'highest pitch': 7.3, 'lowest pitch': 6.41, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '处', 'pinyin': 'chu4', 'highest pitch': 8.76, 'lowest pitch': 6.52, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '熏', 'pinyin': 'xvn1', 'highest pitch': 9.23, 'lowest pitch': 6.94, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '黑', 'pinyin': 'hei1', 'highest pitch': 9.81, 'lowest pitch': 8.23, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.23, 'lowest pitch': 5.96, 'duration': 0.11, 'prosody hierarchy': '#1'}, {'character': '烟', 'pinyin': 'ian1', 'highest pitch': 9.05, 'lowest pitch': 6.06, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '囱', 'pinyin': 'cong1', 'highest pitch': 9.85, 'lowest pitch': 9.34, 'duration': 0.35, 'prosody hierarchy': '#4'}]