名词
中文翻译：Unknown
同义词：
['yellow crystal', 'xanthine crystal']
例句：
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1.The xanthic calculus was found in the riverbed, attracting tourists to explore.
在河床上发现了黄色结晶石，吸引了游客前来探索。
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2. The yellow crystals were used as a natural pigment in ancient paintings.
这些黄色结晶石被用作古代绘画的自然颜料。
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3. The xanthic calculus is believed to have medicinal properties and is often used for its healing effects.
人们相信这种黄色结晶石具有药用价值，常用于其治疗效果。