柯林斯词典trilobite /ˈtraɪləˌbaɪt/ 1. N any extinct marine arthropod of the group Trilobita, abundant in Palaeozoic times, having a segmented exoskeleton divided into three parts 三叶虫纲动物 返回 trilobite剑桥词典a simple , flat sea creature that lived in the earliest period of life on earth , with a hard outer layer and a body in three parts 三叶虫 返回 trilobite