梨形

The toxicity of mercury ion and pesticide cy-permethrin to tetrahymena pyriformis was observed in this study according to the method of aquatic toxicology.

采用梨形四膜虫为实验生物评价了汞离子和安绿宝农药的毒性。

There are 5 stages during the development of embryo, including the stage of 2-celled proembryo, multicellular proembryo, globular proembryo, pyriform proembryo, differential embryo and mature embryo.

胚胎发育经过二胞原胚、多胞原胚、球形原胚、梨形原胚、分化胚和成熟胚阶段。