是的，南海问题越来越紧张了。
中美在南海问题上的交锋有愈演愈烈之势。[{'character': '中', 'pinyin': 'zhong1', 'highest pitch': 10.95, 'lowest pitch': 10.53, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '美', 'pinyin': 'mei3', 'highest pitch': 10.86, 'lowest pitch': 5.76, 'duration': 0.28, 'prosody hierarchy': '#2'}, {'character': '在', 'pinyin': 'zai4', 'highest pitch': 8.52, 'lowest pitch': 7.16, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '南', 'pinyin': 'nan2', 'highest pitch': 10.13, 'lowest pitch': 6.41, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '海', 'pinyin': 'hai3', 'highest pitch': 10.13, 'lowest pitch': 6.14, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '问', 'pinyin': 'uen4', 'highest pitch': 7.66, 'lowest pitch': 6.14, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '题', 'pinyin': 'ti2', 'highest pitch': 7.14, 'lowest pitch': 6.32, 'duration': 0.14, 'prosody hierarchy': 'null'}, {'character': '上', 'pinyin': 'shang4', 'highest pitch': 8.35, 'lowest pitch': 5.92, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 6.11, 'lowest pitch': 5.92, 'duration': 0.08, 'prosody hierarchy': '#1'}, {'character': '交', 'pinyin': 'jiao1', 'highest pitch': 8.38, 'lowest pitch': 5.97, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '锋', 'pinyin': 'feng1', 'highest pitch': 9.08, 'lowest pitch': 8.04, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '有', 'pinyin': 'iou3', 'highest pitch': 8.58, 'lowest pitch': 5.88, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '愈', 'pinyin': 'v4', 'highest pitch': 9.69, 'lowest pitch': 6.33, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '演', 'pinyin': 'ian3', 'highest pitch': 9.18, 'lowest pitch': 5.15, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '愈', 'pinyin': 'v4', 'highest pitch': 9.69, 'lowest pitch': 6.99, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '烈', 'pinyin': 'lie4', 'highest pitch': 10.19, 'lowest pitch': 6.88, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '之', 'pinyin': 'zhiii1', 'highest pitch': 7.4, 'lowest pitch': 6.88, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '势', 'pinyin': 'shiii4', 'highest pitch': 12.58, 'lowest pitch': 6.83, 'duration': 0.25, 'prosody hierarchy': '#4'}]