名词
中文翻译：石笋
同义词：
['fossil', 'stalactite']
例句：
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1.Fossula petrosa is a rare fossil found in the cave.
石笋是洞穴中发现的一种罕见的化石。
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2.The discovery of Fossula petrosa has sparked interest in ancient marine life.
Fossula petrosa的发现激发了对古代海洋生物的兴趣。
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3. Fossula petrosa is often used as a teaching tool to illustrate the evolution of life.
Fossula petrosa经常被用作教学工具，以说明生命的进化过程。