一大群蝗虫a swarm of locusts本图所示为蝗虫的纵剖面.This illustration shows a vertical section through the locust.很快蝗虫就飞落下来开始吃东西,什么都吃.In no time the locusts came down and started eating everything....
横神经通往同体节的气门.The transverse nerves pass to the spiracles of their segment.腹面昆虫的腹部体节.The abdominal segment of an insect.脊椎动物的脊柱来源于体节,体节是胚胎发生过程中的过渡性结构.The vertebral column is derived from somites, which are mesoderm that ar...