我们需要仔细评估一下。
二是没有好的成本收益匡算。[{'character': '二', 'pinyin': 'er4', 'highest pitch': 10.64, 'lowest pitch': 8.87, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 11.71, 'lowest pitch': 7.34, 'duration': 0.3, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.06}, {'character': '没', 'pinyin': 'mei2', 'highest pitch': 10.25, 'lowest pitch': 7.7, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '有', 'pinyin': 'iou2', 'highest pitch': 11.28, 'lowest pitch': 10.25, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '好', 'pinyin': 'hao3', 'highest pitch': 11.1, 'lowest pitch': 4.88, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.42, 'lowest pitch': 5.82, 'duration': 0.13, 'prosody hierarchy': '#1'}, {'character': '成', 'pinyin': 'cheng2', 'highest pitch': 9.17, 'lowest pitch': 6.89, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '本', 'pinyin': 'ben3', 'highest pitch': 9.57, 'lowest pitch': 6.03, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '收', 'pinyin': 'shou1', 'highest pitch': 9.31, 'lowest pitch': 8.99, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '益', 'pinyin': 'i4', 'highest pitch': 9.13, 'lowest pitch': 6.7, 'duration': 0.13, 'prosody hierarchy': '#1'}, {'character': '匡', 'pinyin': 'kuang1', 'highest pitch': 13.12, 'lowest pitch': 6.7, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '算', 'pinyin': 'suan4', 'highest pitch': 10.36, 'lowest pitch': 6.55, 'duration': 0.27, 'prosody hierarchy': '#4'}]