那我们应该多保护鸟类。
不然，我们将无鸟可观。[{'character': '不', 'pinyin': 'bu4', 'highest pitch': 10.93, 'lowest pitch': 9.31, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '然', 'pinyin': 'ran2', 'highest pitch': 9.92, 'lowest pitch': 8.2, 'duration': 0.32, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.14}, {'character': '我', 'pinyin': 'uo3', 'highest pitch': 8.21, 'lowest pitch': 6.6, 'duration': 0.1, 'prosody hierarchy': 'null'}, {'character': '们', 'pinyin': 'men5', 'highest pitch': 6.96, 'lowest pitch': 6.58, 'duration': 0.12, 'prosody hierarchy': 'null'}, {'character': '将', 'pinyin': 'jiang1', 'highest pitch': 9.48, 'lowest pitch': 6.9, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '无', 'pinyin': 'u2', 'highest pitch': 11.26, 'lowest pitch': 7.67, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '鸟', 'pinyin': 'niao2', 'highest pitch': 11.26, 'lowest pitch': 7.0, 'duration': 0.27, 'prosody hierarchy': '#1'}, {'character': '可', 'pinyin': 'ke3', 'highest pitch': 8.79, 'lowest pitch': 5.77, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '观', 'pinyin': 'guan1', 'highest pitch': 8.2, 'lowest pitch': 7.59, 'duration': 0.32, 'prosody hierarchy': '#4'}]