你认为我们应该怎么评级盛大股票？
我们维持对盛大股票的“持有”评级。[{'character': '我', 'pinyin': 'uo3', 'highest pitch': 8.13, 'lowest pitch': 2.82, 'duration': 0.1, 'prosody hierarchy': 'null'}, {'character': '们', 'pinyin': 'men5', 'highest pitch': 8.22, 'lowest pitch': 7.58, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '维', 'pinyin': 'uei2', 'highest pitch': 8.96, 'lowest pitch': 7.73, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '持', 'pinyin': 'chiii2', 'highest pitch': 9.9, 'lowest pitch': 7.33, 'duration': 0.28, 'prosody hierarchy': '#2'}, {'character': '对', 'pinyin': 'duei4', 'highest pitch': 9.26, 'lowest pitch': 8.4, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '盛', 'pinyin': 'sheng4', 'highest pitch': 11.02, 'lowest pitch': 9.93, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '大', 'pinyin': 'da4', 'highest pitch': 10.19, 'lowest pitch': 7.8, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '股', 'pinyin': 'gu3', 'highest pitch': 6.56, 'lowest pitch': 4.72, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '票', 'pinyin': 'piao4', 'highest pitch': 7.98, 'lowest pitch': 5.63, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.18, 'lowest pitch': 5.63, 'duration': 0.13, 'prosody hierarchy': '#2'}, {'character': '持', 'pinyin': 'chiii2', 'highest pitch': 9.9, 'lowest pitch': 5.68, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '有', 'pinyin': 'iou3', 'highest pitch': 9.95, 'lowest pitch': 5.92, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '评', 'pinyin': 'ping2', 'highest pitch': 7.73, 'lowest pitch': 6.34, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '级', 'pinyin': 'ji2', 'highest pitch': 7.36, 'lowest pitch': 5.49, 'duration': 0.35, 'prosody hierarchy': '#4'}]