Unverified80% confidenceTradeoffTime unknown
软尺越软越贴合头部弧度测量越准，但过软的布尺易拉伸变长导致读数偏大；带钢丝内芯的软尺不易拉伸更耐用，两者需权衡
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80%
Confidence
Long-term
Relevance
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