什么时候我们应该出发呢？
乘七四一路赶火车的乘客，最好提早出发。[{'character': '乘', 'pinyin': 'cheng2', 'highest pitch': 10.08, 'lowest pitch': 8.22, 'duration': 0.34, 'prosody hierarchy': '#2'}, {'character': '七', 'pinyin': 'qi1', 'highest pitch': 11.37, 'lowest pitch': 10.08, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '四', 'pinyin': 'sii4', 'highest pitch': 11.24, 'lowest pitch': 9.4, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '一', 'pinyin': 'i1', 'highest pitch': 10.07, 'lowest pitch': 9.17, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '路', 'pinyin': 'lu4', 'highest pitch': 9.7, 'lowest pitch': 7.58, 'duration': 0.22, 'prosody hierarchy': '#1'}, {'character': '赶', 'pinyin': 'gan2', 'highest pitch': 10.84, 'lowest pitch': 7.74, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '火', 'pinyin': 'huo3', 'highest pitch': 13.3, 'lowest pitch': 10.84, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '车', 'pinyin': 'che1', 'highest pitch': 10.21, 'lowest pitch': 9.19, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 10.64, 'lowest pitch': 9.06, 'duration': 0.09, 'prosody hierarchy': '#1'}, {'character': '乘', 'pinyin': 'cheng2', 'highest pitch': 10.08, 'lowest pitch': 5.64, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '客', 'pinyin': 'ke4', 'highest pitch': 8.41, 'lowest pitch': 6.68, 'duration': 0.24, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.09}, {'character': '最', 'pinyin': 'zuei4', 'highest pitch': 8.03, 'lowest pitch': 6.62, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '好', 'pinyin': 'hao3', 'highest pitch': 7.04, 'lowest pitch': 6.93, 'duration': 0.2, 'prosody hierarchy': '#2'}, {'character': '提', 'pinyin': 'ti2', 'highest pitch': 10.57, 'lowest pitch': 7.76, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '早', 'pinyin': 'zao3', 'highest pitch': 11.15, 'lowest pitch': 5.12, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '出', 'pinyin': 'chu1', 'highest pitch': 7.95, 'lowest pitch': 7.01, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '发', 'pinyin': 'fa1', 'highest pitch': 8.74, 'lowest pitch': 7.05, 'duration': 0.3, 'prosody hierarchy': '#4'}]