三叶虫

The thorax and pleon bear a number of lateral appendages, including the gills, and the tail ends with a telson.

另一个古老的特征是甲壳亚门动物分叉的足，这样的足在化石中的三就已经有。

The new framework, comprising a pre-trilobite series and three trilobite-dominated series, reflects the major evolutional stages of the life on Earth during Cambrian Period.

新的划分方案包括1个“前三”和3个“三势”，反武纪生命发展的主要阶段。

On the rank that reachs mummy from cranium of trilobite, dinosaurian egg, pithecanthrope, crockery, remains, get through gives birth to the channel that is born not to cease.

从三、恐龙蛋、猿人头盖骨、瓦器、废墟及木乃伊的列队上,打通生生不息的隧道。