是什么因素导致了变化？
随着环境呀，因素呀有改变呀。[{'character': '随', 'pinyin': 'suei2', 'highest pitch': 9.62, 'lowest pitch': 8.83, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '着', 'pinyin': 'zhe5', 'highest pitch': 10.97, 'lowest pitch': 8.96, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '环', 'pinyin': 'huan2', 'highest pitch': 8.17, 'lowest pitch': 6.64, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '境', 'pinyin': 'jing4', 'highest pitch': 10.33, 'lowest pitch': 8.06, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '呀', 'pinyin': 'ia5', 'highest pitch': 8.62, 'lowest pitch': 5.94, 'duration': 0.28, 'prosody hierarchy': '#2'}, {'character': '因', 'pinyin': 'in1', 'highest pitch': 10.69, 'lowest pitch': 8.85, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '素', 'pinyin': 'su4', 'highest pitch': 10.45, 'lowest pitch': 7.37, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '呀', 'pinyin': 'ia5', 'highest pitch': 8.62, 'lowest pitch': 5.66, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'character': '有', 'pinyin': 'iou2', 'highest pitch': 10.34, 'lowest pitch': 7.8, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '改', 'pinyin': 'gai3', 'highest pitch': 10.12, 'lowest pitch': 4.82, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '变', 'pinyin': 'bian4', 'highest pitch': 10.38, 'lowest pitch': 8.62, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '呀', 'pinyin': 'ia5', 'highest pitch': 8.62, 'lowest pitch': 4.84, 'duration': 0.3, 'prosody hierarchy': '#4'}]