其一，这个设计太简单了。
其二，轴线尺寸不足。[{'character': '其', 'pinyin': 'qi2', 'highest pitch': 9.32, 'lowest pitch': 8.43, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '二', 'pinyin': 'er4', 'highest pitch': 10.11, 'lowest pitch': 7.95, 'duration': 0.28, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.14}, {'character': '轴', 'pinyin': 'zhou2', 'highest pitch': 9.16, 'lowest pitch': 7.01, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '线', 'pinyin': 'xian4', 'highest pitch': 11.38, 'lowest pitch': 9.16, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '尺', 'pinyin': 'chiii3', 'highest pitch': 9.37, 'lowest pitch': 5.15, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '寸', 'pinyin': 'cuen4', 'highest pitch': 8.59, 'lowest pitch': 5.15, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '不', 'pinyin': 'bu4', 'highest pitch': 8.51, 'lowest pitch': 6.16, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '足', 'pinyin': 'zu2', 'highest pitch': 6.8, 'lowest pitch': 5.59, 'duration': 0.31, 'prosody hierarchy': '#4'}]