英语词汇protoxylem怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	protoxylem
释义	protoxylem 英/ ?pr??t??za?l?m / 美/ ?pro?t??za?l?m / 简明释义 n.[植] 原生木质部网络释义 1 [植]?原生木质部外方为最先分化成熟的木质部,称原生木质部 (Protoxylem),导管直径较小,多呈环纹或螺纹;后分化成熟的木质部,称后生木质部 (metaxylem),导管直径较大,多呈梯纹、网纹或孔纹。 2 ?初生木质部 ... prototype 原型 protoxylem 初生木质部 protozoans 原生动物 ... 短语 1 protoxylem lacuna 植原生木质部腔隙 2 protoxylem pole 植原生木质部极 3 protoxylem strand 原生木质部束双语例句 1 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。 2 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。 3 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。词源 1 protoxylem: proto- +? xylem FROM: wiktionary
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