egg case造句

• A similar natural protective covering or structure , such as the egg case of a spider
  茧状物类似的自然保护覆盖层或结构，例如蜘蛛的蛋壳
• It can be found in the cell walls of fungi and the exoskeletons of shellfish , plankton and insects , along with insect egg cases and the powerful grinders and rigid walls in the pharynx of worms
  同样见于真菌细胞壁和甲壳类动物、浮游生物和昆虫的外骨架，多见于昆虫卵鞘和蠕虫咽部硬管壁和强有力的研磨器官。