sphaeromastigote

例句：

1. 1. The sphaeromastigote stage is the first stage of the malaria parasite in humans.
   疟原虫在人类体内的孢子囊内原生动物阶段是第一个阶段。
2. 2.During this stage, the sphaeromastigote undergoes a series of transformations to become an adult plasmodium.
   在这一阶段，孢子囊内原生动物经历一系列变化，最终成为成年疟原虫。
3. 3. Researchers have been studying the life cycle of the sphaeromastigote and its interactions with other stages of the parasite.
   研究人员一直在研究孢子囊内原生动物的生命周期及其与其他阶段寄生虫的相互作用。