protoxylem / ˌproʊ təˈzaɪ ləm, -lɛm /

📖毕业后词汇原生态原生型原生代原生质感

protoxylem 的定义

n. 名词 noun

Botany.

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