名词
中文翻译：Unknown
同义词：
['shell fossil', 'pearl layer', 'pearl mother']
例句：
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1. The pallasite in the museum is a rare find from ancient times.
博物馆里的贝壳化石是古代稀有的发现。
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2. The pearl layer on the seabed is a valuable resource for the pearl industry.
海底的珍珠层是珍珠行业的宝贵资源。
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3. The pearl mother is a symbol of purity and beauty in Chinese culture.
珍珠母在中国文化中象征着纯洁和美丽。