Trilophodon

例句：

1. 1.Trilophodons are one of the oldest known species on Earth.
   三叶虫是地球上已知的最古老的物种之一。
2. 2.The discovery of trilophodons in the fossil record has shed light on the evolution of life on Earth.
   在化石记录中发现三叶虫，揭示了地球上生命演化的线索。
3. 3. Trilophodons were once thought to be extinct, but recent discoveries have revived their existence.
   三叶虫一度被认为是已经灭绝的，但最近的发现使它们重新出现。