名词
中文翻译：粉笔土
同义词：
['chalk', 'chalk dust', 'chalkboard soil']
例句：
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1.The teacher used chalk to mark the board during class.
老师在上课时用粉笔在黑板上做标记。
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2.The children were playing with chalk soil on the playground.
孩子们在操场上用粉笔土玩耍。
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3.The old man was using chalk soil to clean his glasses.
老人用粉笔土来擦他的眼镜。