praepupa

例句：

1. 1.The caterpillars are transforming into butterflies during the pupation stage.
   毛毛虫在蛹期正在变成蝴蝶。
2. 2.The spider's larvae feed on insects.
   蜘蛛的幼虫以昆虫为食。
3. 3. The scientists observed the development of the larva from its egg stage to adulthood.
   科学家们观察了从卵到成虫的发展过程。