你为什么要起诉前夫？
为养儿防老，王女士起诉前夫，欲讨回女儿的抚养权。[{'character': '为', 'pinyin': 'uei4', 'highest pitch': 10.57, 'lowest pitch': 8.51, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '养', 'pinyin': 'iang3', 'highest pitch': 10.07, 'lowest pitch': 5.23, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '儿', 'pinyin': 'er2', 'highest pitch': 9.76, 'lowest pitch': 5.21, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '防', 'pinyin': 'fang2', 'highest pitch': 10.13, 'lowest pitch': 7.5, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '老', 'pinyin': 'lao3', 'highest pitch': 10.13, 'lowest pitch': 3.62, 'duration': 0.3, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.21}, {'character': '王', 'pinyin': 'uang2', 'highest pitch': 10.91, 'lowest pitch': 7.15, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '女', 'pinyin': 'nv3', 'highest pitch': 11.0, 'lowest pitch': 7.29, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '士', 'pinyin': 'shiii4', 'highest pitch': 7.87, 'lowest pitch': 6.58, 'duration': 0.22, 'prosody hierarchy': '#2'}, {'character': '起', 'pinyin': 'qi3', 'highest pitch': 6.58, 'lowest pitch': 5.69, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '诉', 'pinyin': 'su4', 'highest pitch': 7.44, 'lowest pitch': 5.76, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '前', 'pinyin': 'qian2', 'highest pitch': 7.45, 'lowest pitch': 6.23, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '夫', 'pinyin': 'fu1', 'highest pitch': 8.93, 'lowest pitch': 7.45, 'duration': 0.27, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.27}, {'character': '欲', 'pinyin': 'v4', 'highest pitch': 8.26, 'lowest pitch': 6.55, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '讨', 'pinyin': 'tao3', 'highest pitch': 7.21, 'lowest pitch': 6.03, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '回', 'pinyin': 'huei2', 'highest pitch': 8.41, 'lowest pitch': 6.79, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '女', 'pinyin': 'nv3', 'highest pitch': 11.0, 'lowest pitch': 5.6, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '儿', 'pinyin': 'er2', 'highest pitch': 9.76, 'lowest pitch': 5.53, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.51, 'lowest pitch': 7.96, 'duration': 0.13, 'prosody hierarchy': '#1'}, {'character': '抚', 'pinyin': 'fu2', 'highest pitch': 9.41, 'lowest pitch': 7.31, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '养', 'pinyin': 'iang3', 'highest pitch': 10.07, 'lowest pitch': 6.88, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '权', 'pinyin': 'qvan2', 'highest pitch': 7.0, 'lowest pitch': 5.11, 'duration': 0.38, 'prosody hierarchy': '#4'}]