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。
