Unverified80% confidenceTradeoffTime unknown
0.5mm笔芯笔迹细腻但抗压性弱，适合书写工整的高年级学生；0.7mm更耐用抗断但笔迹偏粗，做数学演算大量书写时0.7mm更省心——两者难以兼得精细与耐用
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80%
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Long-term
Relevance
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