tri-lobe cam

例句：

1. 1. The trilobite cam is a fascinating creature that has been around for millions of years.
   三叶瓣轮是一种令人着迷的生物，已经存在了数百万年。
2. 2. Trilobites are often used in fossils to help scientists study the evolution of life on Earth.
   三叶瓣轮常被用于化石中，帮助科学家研究地球上生命的进化。
3. 3.In ancient times, trilobites were used as tools and weapons by humans and other animals.
   在古代，三叶瓣轮被人类和其他动物用作工具和武器。