名词
中文翻译：粉笔
同义词：
['chalk dust', 'chalkboard', 'chalkboard marker']
例句：
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1. The teacher used a chalk to draw the outline of the map on the blackboard.
老师用粉笔在黑板上画地图的轮廓。
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2. The students gathered around the chalk to copy the teacher's example.
学生们围在粉笔周围，复制老师的示例。
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3. The chalk marks are difficult to erase, so it's important to write clearly.
粉笔痕迹难以擦除，因此写清楚很重要。