trilobita 基本例句 三叶虫纲,三叶虫,三叶虫类 Slowly inching his segmented exoskeleton across the sea floor, a local marine arthropod, class Trilobita, reported that Earth's natural evolution was“ progressing quite nicely.” 一只本地海洋节肢生物带着它的节肢外壳慢慢的在海底穿行，标准三叶虫，这说明地球自然演化是“绝妙的进展”。 yeeyan