Unverified85% confidenceSolutionTime unknown
新买的黑板贴应先用侧面平躺的粉笔全面涂抹一遍再擦掉（开荒/养板），可填充表面微孔，否则第一次写的字会永久留印
1
Sources
85%
Confidence
Long-term
Relevance
-
First Seen
Sources
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