| 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。
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| 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。
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| 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。
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| 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。
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| 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。
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| 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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