上一交易日人民币兑美元汇率又下跌了吗？
上一交易日人民币兑美元汇率为六点三七九七元。[{'character': '上', 'pinyin': 'shang4', 'highest pitch': 11.33, 'lowest pitch': 9.86, 'duration': 0.29, 'prosody hierarchy': 'null'}, {'character': '一', 'pinyin': 'i4', 'highest pitch': 9.86, 'lowest pitch': 7.62, 'duration': 0.12, 'prosody hierarchy': '#1'}, {'character': '交', 'pinyin': 'jiao1', 'highest pitch': 8.97, 'lowest pitch': 7.62, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '易', 'pinyin': 'i4', 'highest pitch': 9.86, 'lowest pitch': 7.45, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '日', 'pinyin': 'riii4', 'highest pitch': 7.55, 'lowest pitch': 5.0, 'duration': 0.26, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.14}, {'character': '人', 'pinyin': 'ren2', 'highest pitch': 9.44, 'lowest pitch': 7.59, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '民', 'pinyin': 'min2', 'highest pitch': 9.47, 'lowest pitch': 8.77, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '币', 'pinyin': 'bi4', 'highest pitch': 9.72, 'lowest pitch': 8.44, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '兑', 'pinyin': 'duei4', 'highest pitch': 9.41, 'lowest pitch': 7.54, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '美', 'pinyin': 'mei3', 'highest pitch': 7.54, 'lowest pitch': 4.83, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '元', 'pinyin': 'van2', 'highest pitch': 9.12, 'lowest pitch': 4.9, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '汇', 'pinyin': 'huei4', 'highest pitch': 10.26, 'lowest pitch': 7.45, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '率', 'pinyin': 'lv4', 'highest pitch': 8.63, 'lowest pitch': 6.56, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '为', 'pinyin': 'uei2', 'highest pitch': 7.06, 'lowest pitch': 5.64, 'duration': 0.32, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.33}, {'character': '六', 'pinyin': 'liou4', 'highest pitch': 10.14, 'lowest pitch': 8.8, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '点', 'pinyin': 'dian3', 'highest pitch': 7.37, 'lowest pitch': 5.23, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'character': '三', 'pinyin': 'san1', 'highest pitch': 9.31, 'lowest pitch': 9.0, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '七', 'pinyin': 'qi1', 'highest pitch': 10.3, 'lowest pitch': 9.47, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '九', 'pinyin': 'jiou3', 'highest pitch': 9.47, 'lowest pitch': 4.41, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '七', 'pinyin': 'qi1', 'highest pitch': 10.3, 'lowest pitch': 4.88, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '元', 'pinyin': 'van2', 'highest pitch': 9.12, 'lowest pitch': 5.28, 'duration': 0.33, 'prosody hierarchy': '#4'}]