我们应该保护古城墙才对。
但如今，古城墙却被剥了皮，凿成窑洞，城砖也被垒成猪窝。[{'character': '但', 'pinyin': 'dan4', 'highest pitch': 9.74, 'lowest pitch': 7.77, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '如', 'pinyin': 'ru2', 'highest pitch': 8.11, 'lowest pitch': 7.26, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '今', 'pinyin': 'jin1', 'highest pitch': 9.82, 'lowest pitch': 7.61, 'duration': 0.3, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.11}, {'character': '古', 'pinyin': 'gu3', 'highest pitch': 9.02, 'lowest pitch': 7.29, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '城', 'pinyin': 'cheng2', 'highest pitch': 10.86, 'lowest pitch': 7.29, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '墙', 'pinyin': 'qiang2', 'highest pitch': 10.84, 'lowest pitch': 6.36, 'duration': 0.3, 'prosody hierarchy': '#2'}, {'character': '却', 'pinyin': 'qve4', 'highest pitch': 9.45, 'lowest pitch': 6.8, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '被', 'pinyin': 'bei4', 'highest pitch': 8.28, 'lowest pitch': 6.49, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '剥', 'pinyin': 'bo1', 'highest pitch': 10.39, 'lowest pitch': 6.49, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '了', 'pinyin': 'le5', 'highest pitch': 10.34, 'lowest pitch': 7.77, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '皮', 'pinyin': 'pi2', 'highest pitch': 8.0, 'lowest pitch': 5.31, 'duration': 0.37, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.11}, {'character': '凿', 'pinyin': 'zao2', 'highest pitch': 10.11, 'lowest pitch': 7.82, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '成', 'pinyin': 'cheng2', 'highest pitch': 10.86, 'lowest pitch': 9.15, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '窑', 'pinyin': 'iao2', 'highest pitch': 9.15, 'lowest pitch': 5.27, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '洞', 'pinyin': 'dong4', 'highest pitch': 10.45, 'lowest pitch': 6.17, 'duration': 0.25, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.39}, {'character': '城', 'pinyin': 'cheng2', 'highest pitch': 10.86, 'lowest pitch': 7.17, 'duration': 0.29, 'prosody hierarchy': 'null'}, {'character': '砖', 'pinyin': 'zhuan1', 'highest pitch': 10.76, 'lowest pitch': 8.1, 'duration': 0.29, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.11}, {'character': '也', 'pinyin': 'ie3', 'highest pitch': 8.58, 'lowest pitch': 6.05, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '被', 'pinyin': 'bei4', 'highest pitch': 8.28, 'lowest pitch': 6.87, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '垒', 'pinyin': 'lei3', 'highest pitch': 6.87, 'lowest pitch': 4.7, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '成', 'pinyin': 'cheng2', 'highest pitch': 10.86, 'lowest pitch': 4.7, 'duration': 0.25, 'prosody hierarchy': '#1'}, {'character': '猪', 'pinyin': 'zhu1', 'highest pitch': 9.13, 'lowest pitch': 7.45, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '窝', 'pinyin': 'uo1', 'highest pitch': 9.35, 'lowest pitch': 8.91, 'duration': 0.3, 'prosody hierarchy': '#4'}]