protophloem / ˌproʊ təˈfloʊ ɛm /

📖毕业后词汇原生细胞原生植物原生质体原生动物

protophloem 的定义

n. 名词 noun

Botany.

  1. the part of the primary phloem that develops first, consisting of narrow, thin-walled cells.