pulp metaplasia

例句：

1. 1. The plant's root system is undergoing a pulp metaplasia process.
   植物的根系正在经历一个胚乳异化过程。
2. 2. This disease is caused by an endophyte that has metamorphosed into a pathogen.
   这种疾病是由一种胚乳异化的内生菌转变成病原体引起的。
3. 3. During the metamorphic stage, the larva undergoes a series of changes to become a pupa.
   在变态阶段，幼虫经历了一系列的改变，最终成为蛹。