Abstract: Double steel-ball extrusion deep hole solves the matching problem of steel-ball nucellus with workpiece axis, 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。
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。
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。
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。
About weeks after pollination, the tip cells of nucellus broke and secreted liquid into ovular canal, which promoted po传粉后约 周 ,珠心顶端破裂 ,分泌物进入珠孔道 ,并与珠被分泌物共同作用于花粉 ,使花粉向珠心移动。