英语单词

nucellus是什么意思

发布时间：2021-03-01 作者：英语查

nucellus 是什么意思

名词复数:nucelli

中文翻译与英英解释

	n. (pl. -celli ) 【植物；植物学】珠心。 nucellar adj.

central part of a plant ovule; contains the embryo sac

例句与用法

	1.	The nucellus is usually degraded and absorbed as the endosperm develops . 珠心通常在胚乳发育时被分解和吸收。
	2.	The cells of the integument and nucellus of some plants form perfectly normal embryos . 某些植物的珠被和珠心细胞形成完全正常的胚。
	3.	Chalaza ( pl . chalaxae or chalazas ) the region of an angiosperm ovule where the nucellus and integuments merge 合点：被子植物胚珠上的一个区域，在合点处珠心和珠被愈合。
	4.	In endospermic seeds the endosperm replaces the nucellus and is often a rich source of growth - regulating substances 在有胚乳种子中，胚乳取代珠心，成为生长调节物质（应为营养物质译者注）的丰富来源。
	5.	Enclosure of the nucellus by the integuments is incomplete , the embryo sac or , in gymnosperms , to the archegonium 珠被并不是将珠心完全封闭，而是留有珠孔以便受精时花粉管进入胚囊，或裸子植物的藏卵器。
	6.	Abstract : double steel - ball extrusion deep hole solves the matching problem of steel - ball nucellus with workpiece axis , using this technology , extruding deep hole with smaudiameter is attained efficiently with high quality . it has been proved that the special problem of finishing curved hole is able to be solved 文摘:双珠式挤压深孔有效地解决了钢珠珠心与工件轴心重合的问题，高质高效地实现了较小直径深孔的挤压加工，实践证明，且能实现弯孔的高精加工。

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