三叶虫

例句：

1. 1. The fossilized remains of a trilobite were discovered in the ocean floor.
   在海洋底部发现了一种三叶虫的化石遗骸。
2. 2.Trilobites are known for their unique body shape and adaptation to life underwater.
   三叶虫以其独特的身体结构和适应水下生活而闻名。
3. 3. In ancient times, trilobites were used as currency by some tribes due to their rarity.
   古代某些部落因为三叶虫的稀有性，将其作为货币使用。