我们应该提前预订机票。
有时，一趟航班仅三百多名旅客。[{'character': '有', 'pinyin': 'iou3', 'highest pitch': 7.99, 'lowest pitch': 7.01, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '时', 'pinyin': 'shiii2', 'highest pitch': 8.27, 'lowest pitch': 6.96, 'duration': 0.3, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.16}, {'character': '一', 'pinyin': 'i2', 'highest pitch': 8.18, 'lowest pitch': 7.33, 'duration': 0.12, 'prosody hierarchy': 'null'}, {'character': '趟', 'pinyin': 'tang4', 'highest pitch': 10.34, 'lowest pitch': 8.99, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '航', 'pinyin': 'hang2', 'highest pitch': 9.23, 'lowest pitch': 7.0, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '班', 'pinyin': 'ban1', 'highest pitch': 10.01, 'lowest pitch': 9.13, 'duration': 0.23, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.04}, {'character': '仅', 'pinyin': 'jin3', 'highest pitch': 8.1, 'lowest pitch': 5.61, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '三', 'pinyin': 'san1', 'highest pitch': 10.38, 'lowest pitch': 5.83, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '百', 'pinyin': 'bai3', 'highest pitch': 10.32, 'lowest pitch': 5.64, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '多', 'pinyin': 'duo1', 'highest pitch': 6.9, 'lowest pitch': 5.64, 'duration': 0.12, 'prosody hierarchy': 'null'}, {'character': '名', 'pinyin': 'ming2', 'highest pitch': 6.93, 'lowest pitch': 6.47, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '旅', 'pinyin': 'lv3', 'highest pitch': 6.93, 'lowest pitch': 4.47, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '客', 'pinyin': 'ke4', 'highest pitch': 14.05, 'lowest pitch': 5.55, 'duration': 0.34, 'prosody hierarchy': '#4'}]