我听到了这个消息，很激动。
这是中国国家元首首次访美。[{'character': '这', 'pinyin': 'zhe4', 'highest pitch': 10.42, 'lowest pitch': 9.2, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 9.41, 'lowest pitch': 7.5, 'duration': 0.24, 'prosody hierarchy': '#2'}, {'character': '中', 'pinyin': 'zhong1', 'highest pitch': 10.74, 'lowest pitch': 7.5, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '国', 'pinyin': 'guo2', 'highest pitch': 10.2, 'lowest pitch': 7.72, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '国', 'pinyin': 'guo2', 'highest pitch': 10.2, 'lowest pitch': 7.61, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '家', 'pinyin': 'jia1', 'highest pitch': 10.04, 'lowest pitch': 7.61, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '元', 'pinyin': 'van2', 'highest pitch': 9.56, 'lowest pitch': 6.97, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '首', 'pinyin': 'shou3', 'highest pitch': 9.31, 'lowest pitch': 5.64, 'duration': 0.27, 'prosody hierarchy': '#2'}, {'character': '首', 'pinyin': 'shou3', 'highest pitch': 9.31, 'lowest pitch': 5.07, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '次', 'pinyin': 'cii4', 'highest pitch': 11.02, 'lowest pitch': 5.07, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '访', 'pinyin': 'fang2', 'highest pitch': 10.6, 'lowest pitch': 6.78, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '美', 'pinyin': 'mei3', 'highest pitch': 7.54, 'lowest pitch': 4.2, 'duration': 0.36, 'prosody hierarchy': '#4'}]