我们需要一个好的音响系统。
制作音箱喇叭是关键。[{'character': '制', 'pinyin': 'zhiii4', 'highest pitch': 10.75, 'lowest pitch': 9.08, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '作', 'pinyin': 'zuo4', 'highest pitch': 9.47, 'lowest pitch': 8.18, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '音', 'pinyin': 'in1', 'highest pitch': 9.92, 'lowest pitch': 8.15, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '箱', 'pinyin': 'xiang1', 'highest pitch': 10.77, 'lowest pitch': 9.79, 'duration': 0.3, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.08}, {'character': '喇', 'pinyin': 'la3', 'highest pitch': 8.39, 'lowest pitch': 5.05, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '叭', 'pinyin': 'ba5', 'highest pitch': 10.13, 'lowest pitch': 6.55, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 10.88, 'lowest pitch': 8.12, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '关', 'pinyin': 'guan1', 'highest pitch': 8.69, 'lowest pitch': 7.56, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '键', 'pinyin': 'jian4', 'highest pitch': 8.29, 'lowest pitch': 5.97, 'duration': 0.32, 'prosody hierarchy': '#4'}]