电梯有问题吗？
坐上电梯后，它抖抖突然掉下来了，没有任何先兆。[{'character': '坐', 'pinyin': 'zuo4', 'highest pitch': 10.21, 'lowest pitch': 9.53, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '上', 'pinyin': 'shang4', 'highest pitch': 10.38, 'lowest pitch': 8.38, 'duration': 0.24, 'prosody hierarchy': '#1'}, {'character': '电', 'pinyin': 'dian4', 'highest pitch': 9.92, 'lowest pitch': 8.38, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '梯', 'pinyin': 'ti1', 'highest pitch': 10.37, 'lowest pitch': 9.89, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '后', 'pinyin': 'hou4', 'highest pitch': 10.75, 'lowest pitch': 6.92, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.24}, {'character': '它', 'pinyin': 'ta1', 'highest pitch': 8.31, 'lowest pitch': 7.47, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '抖', 'pinyin': 'dou2', 'highest pitch': 7.53, 'lowest pitch': 6.42, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '抖', 'pinyin': 'dou3', 'highest pitch': 14.07, 'lowest pitch': 4.68, 'duration': 0.31, 'prosody hierarchy': '#2'}, {'character': '突', 'pinyin': 'tu1', 'highest pitch': 11.27, 'lowest pitch': 10.81, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '然', 'pinyin': 'ran2', 'highest pitch': 11.45, 'lowest pitch': 7.81, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '掉', 'pinyin': 'diao4', 'highest pitch': 10.86, 'lowest pitch': 9.0, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '下', 'pinyin': 'xia4', 'highest pitch': 9.15, 'lowest pitch': 6.42, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '来', 'pinyin': 'lai2', 'highest pitch': 6.42, 'lowest pitch': 4.38, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '了', 'pinyin': 'le5', 'highest pitch': 6.09, 'lowest pitch': 4.57, 'duration': 0.19, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.21}, {'character': '没', 'pinyin': 'mei2', 'highest pitch': 11.02, 'lowest pitch': 6.73, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '有', 'pinyin': 'iou3', 'highest pitch': 11.28, 'lowest pitch': 8.64, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '任', 'pinyin': 'ren4', 'highest pitch': 8.89, 'lowest pitch': 6.89, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '何', 'pinyin': 'he2', 'highest pitch': 7.05, 'lowest pitch': 6.1, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '先', 'pinyin': 'xian1', 'highest pitch': 7.66, 'lowest pitch': 6.16, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '兆', 'pinyin': 'zhao4', 'highest pitch': 7.52, 'lowest pitch': 4.89, 'duration': 0.3, 'prosody hierarchy': '#4'}]