那真是一个污染环境的年代。
在那个年代，工厂烟囱常被比喻成“黑色的撒旦”。[{'character': '在', 'pinyin': 'zai4', 'highest pitch': 10.4, 'lowest pitch': 10.16, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '那', 'pinyin': 'na4', 'highest pitch': 11.13, 'lowest pitch': 8.96, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '个', 'pinyin': 'ge5', 'highest pitch': 9.21, 'lowest pitch': 8.56, 'duration': 0.09, 'prosody hierarchy': '#1'}, {'character': '年', 'pinyin': 'nian2', 'highest pitch': 8.56, 'lowest pitch': 6.0, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '代', 'pinyin': 'dai4', 'highest pitch': 8.33, 'lowest pitch': 6.39, 'duration': 0.27, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.13}, {'character': '工', 'pinyin': 'gong1', 'highest pitch': 9.55, 'lowest pitch': 9.14, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '厂', 'pinyin': 'chang3', 'highest pitch': 9.17, 'lowest pitch': 5.59, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '烟', 'pinyin': 'ian1', 'highest pitch': 8.18, 'lowest pitch': 6.15, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '囱', 'pinyin': 'cong1', 'highest pitch': 9.24, 'lowest pitch': 8.18, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '常', 'pinyin': 'chang2', 'highest pitch': 9.03, 'lowest pitch': 6.06, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '被', 'pinyin': 'bei4', 'highest pitch': 8.02, 'lowest pitch': 6.16, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '比', 'pinyin': 'bi3', 'highest pitch': 6.16, 'lowest pitch': 4.41, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '喻', 'pinyin': 'v4', 'highest pitch': 6.34, 'lowest pitch': 4.73, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '成', 'pinyin': 'cheng2', 'highest pitch': 6.92, 'lowest pitch': 5.36, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '黑', 'pinyin': 'hei1', 'highest pitch': 9.53, 'lowest pitch': 6.92, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '色', 'pinyin': 'se4', 'highest pitch': 9.97, 'lowest pitch': 6.72, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.75, 'lowest pitch': 5.86, 'duration': 0.1, 'prosody hierarchy': '#1'}, {'character': '撒', 'pinyin': 'sa1', 'highest pitch': 9.18, 'lowest pitch': 5.96, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '旦', 'pinyin': 'dan4', 'highest pitch': 10.0, 'lowest pitch': 5.99, 'duration': 0.28, 'prosody hierarchy': '#4'}]