名词
中文翻译：硬粉笔
同义词：
['hard slate', 'hard stone']
例句：
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1.He used to use a hard chalk to write on the blackboard.
他过去常用硬粉笔在黑板上写字。
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2.The teacher asked the students to use hard chalk to draw their names on the whiteboard.
老师要求学生们用硬粉笔在白板上写下他们的名字。
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3.The children were using hard chalk to practice their writing skills.
孩子们正在用硬粉笔练习他们的书写技巧。