柯林斯英汉双解大词典
protoxylem /ˌprəʊtəˈzaɪləm/
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1.
N the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin 原生木质部 → compare metaxylem
双语例句
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It is found in protoxylem and first metaxylem tracheids and vessels.
可在原生木质部和初始后生木质部的管胞和导管中见到。
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Protoxylem the PRIMARY xylem elements that are formed from the procambium first.
初生木质部的成分，最早由原形成层形成。
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Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.
环状加厚：原生木质部导管和管胞的内层环状増厚。
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