院墙最近有什么变化吗？
院墙被石棉瓦遮掩上了。[{'character': '院', 'pinyin': 'van4', 'highest pitch': 10.94, 'lowest pitch': 8.99, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '墙', 'pinyin': 'qiang2', 'highest pitch': 8.99, 'lowest pitch': 6.49, 'duration': 0.37, 'prosody hierarchy': '#2'}, {'character': '被', 'pinyin': 'bei4', 'highest pitch': 9.65, 'lowest pitch': 8.31, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '石', 'pinyin': 'shiii2', 'highest pitch': 9.47, 'lowest pitch': 8.31, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '棉', 'pinyin': 'mian2', 'highest pitch': 10.17, 'lowest pitch': 9.19, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '瓦', 'pinyin': 'ua3', 'highest pitch': 10.14, 'lowest pitch': 4.32, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '遮', 'pinyin': 'zhe1', 'highest pitch': 10.98, 'lowest pitch': 9.49, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '掩', 'pinyin': 'ian3', 'highest pitch': 10.42, 'lowest pitch': 5.16, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '上', 'pinyin': 'shang4', 'highest pitch': 6.83, 'lowest pitch': 4.9, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '了', 'pinyin': 'le5', 'highest pitch': 4.9, 'lowest pitch': 4.43, 'duration': 0.18, 'prosody hierarchy': '#4'}]