为了应对当前的紧急情况。
美军为何还迫不及待地要动用第四步兵师？[{'character': '美', 'pinyin': 'mei3', 'highest pitch': 8.21, 'lowest pitch': 6.52, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '军', 'pinyin': 'jvn1', 'highest pitch': 11.29, 'lowest pitch': 6.52, 'duration': 0.31, 'prosody hierarchy': '#2'}, {'character': '为', 'pinyin': 'uei4', 'highest pitch': 11.1, 'lowest pitch': 8.52, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '何', 'pinyin': 'he2', 'highest pitch': 8.52, 'lowest pitch': 7.52, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '还', 'pinyin': 'hai2', 'highest pitch': 8.22, 'lowest pitch': 6.29, 'duration': 0.22, 'prosody hierarchy': '#1'}, {'character': '迫', 'pinyin': 'po4', 'highest pitch': 11.23, 'lowest pitch': 9.71, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '不', 'pinyin': 'bu4', 'highest pitch': 9.71, 'lowest pitch': 6.95, 'duration': 0.12, 'prosody hierarchy': 'null'}, {'character': '及', 'pinyin': 'ji2', 'highest pitch': 6.95, 'lowest pitch': 6.15, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '待', 'pinyin': 'dai4', 'highest pitch': 7.66, 'lowest pitch': 5.82, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '地', 'pinyin': 'de5', 'highest pitch': 13.77, 'lowest pitch': 5.64, 'duration': 0.15, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.06}, {'character': '要', 'pinyin': 'iao4', 'highest pitch': 7.63, 'lowest pitch': 6.08, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '动', 'pinyin': 'dong4', 'highest pitch': 8.52, 'lowest pitch': 7.06, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '用', 'pinyin': 'iong4', 'highest pitch': 7.52, 'lowest pitch': 6.55, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '第', 'pinyin': 'di4', 'highest pitch': 9.4, 'lowest pitch': 9.15, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '四', 'pinyin': 'sii4', 'highest pitch': 11.53, 'lowest pitch': 9.25, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '步', 'pinyin': 'bu4', 'highest pitch': 9.71, 'lowest pitch': 5.72, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '兵', 'pinyin': 'bing1', 'highest pitch': 7.82, 'lowest pitch': 7.25, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '师', 'pinyin': 'shiii1', 'highest pitch': 8.79, 'lowest pitch': 7.82, 'duration': 0.3, 'prosody hierarchy': '#4'}]