我们需要一个清洁工来擦窗户。
有危险的地方不要让学生清扫，比如擦窗户。[{'character': '有', 'pinyin': 'iou3', 'highest pitch': 8.38, 'lowest pitch': 7.08, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '危', 'pinyin': 'uei1', 'highest pitch': 11.28, 'lowest pitch': 7.94, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '险', 'pinyin': 'xian3', 'highest pitch': 10.95, 'lowest pitch': 6.52, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.74, 'lowest pitch': 6.52, 'duration': 0.1, 'prosody hierarchy': '#1'}, {'character': '地', 'pinyin': 'di4', 'highest pitch': 8.77, 'lowest pitch': 7.37, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '方', 'pinyin': 'fang1', 'highest pitch': 9.23, 'lowest pitch': 7.45, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.06}, {'character': '不', 'pinyin': 'bu2', 'highest pitch': 7.78, 'lowest pitch': 6.31, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '要', 'pinyin': 'iao4', 'highest pitch': 11.16, 'lowest pitch': 7.78, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '让', 'pinyin': 'rang4', 'highest pitch': 10.41, 'lowest pitch': 7.7, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '学', 'pinyin': 'xve2', 'highest pitch': 7.12, 'lowest pitch': 6.58, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '生', 'pinyin': 'sheng1', 'highest pitch': 8.84, 'lowest pitch': 6.75, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '清', 'pinyin': 'qing1', 'highest pitch': 8.94, 'lowest pitch': 8.47, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '扫', 'pinyin': 'sao3', 'highest pitch': 4.38, 'lowest pitch': 1.5, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.21}, {'character': '比', 'pinyin': 'bi3', 'highest pitch': 7.1, 'lowest pitch': 5.28, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '如', 'pinyin': 'ru2', 'highest pitch': 6.25, 'lowest pitch': 4.83, 'duration': 0.22, 'prosody hierarchy': '#2'}, {'character': '擦', 'pinyin': 'ca1', 'highest pitch': 9.3, 'lowest pitch': 8.97, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '窗', 'pinyin': 'chuang1', 'highest pitch': 10.68, 'lowest pitch': 9.9, 'duration': 0.29, 'prosody hierarchy': 'null'}, {'character': '户', 'pinyin': 'hu5', 'highest pitch': 13.39, 'lowest pitch': 7.45, 'duration': 0.25, 'prosody hierarchy': '#4'}]