trianethole

例句：

1. 1.The fossils found in the cave are a rare find for scientists.
   洞穴中发现的化石对科学家来说是罕见的发现。
2. 2. Trilobites were once common in the oceans, but now they are mostly extinct.
   三叶虫曾经是海洋中的常见生物，但现在它们大多数已经灭绝了。
3. 3.The discovery of new species of trilobites has sparked new research into their evolution.
   新物种三叶虫的发现激发了关于其进化的新研究。