是的，我听说美国的孩子发育得很快。
也就是说，美国儿童整整早熟了五岁。[{'character': '也', 'pinyin': 'ie3', 'highest pitch': 8.76, 'lowest pitch': 7.63, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '就', 'pinyin': 'jiou4', 'highest pitch': 10.96, 'lowest pitch': 7.63, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 9.57, 'lowest pitch': 8.68, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '说', 'pinyin': 'shuo1', 'highest pitch': 10.13, 'lowest pitch': 9.9, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.23}, {'character': '美', 'pinyin': 'mei3', 'highest pitch': 8.65, 'lowest pitch': 6.65, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '国', 'pinyin': 'guo2', 'highest pitch': 10.82, 'lowest pitch': 9.24, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '儿', 'pinyin': 'er2', 'highest pitch': 10.35, 'lowest pitch': 8.88, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '童', 'pinyin': 'tong2', 'highest pitch': 9.08, 'lowest pitch': 7.26, 'duration': 0.3, 'prosody hierarchy': '#2'}, {'character': '整', 'pinyin': 'zheng2', 'highest pitch': 9.01, 'lowest pitch': 7.55, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '整', 'pinyin': 'zheng2', 'highest pitch': 9.01, 'lowest pitch': 7.69, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '早', 'pinyin': 'zao3', 'highest pitch': 8.95, 'lowest pitch': 5.75, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '熟', 'pinyin': 'shu2', 'highest pitch': 8.08, 'lowest pitch': 5.92, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '了', 'pinyin': 'le5', 'highest pitch': 10.32, 'lowest pitch': 8.08, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '五', 'pinyin': 'u3', 'highest pitch': 9.49, 'lowest pitch': 4.65, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '岁', 'pinyin': 'suei4', 'highest pitch': 10.05, 'lowest pitch': 6.61, 'duration': 0.28, 'prosody hierarchy': '#4'}]