欧洲的一种山楂属植物，叶深裂，果亮红色；在园艺上已培育出各种不同的类型，常用作绿篱；在北美东部成为逸生种。
European hawthorn having deeply cleft leaves and bright red fruits; widely cultivated in many varieties and often grown as impenetrable hedges; established as an escape in eastern North America.
同时考虑到实际生产上的因素，对压铸工艺和主要参数进行分析，从而达到对风叶传动盘的合理设计的要求，设计出相应的模具。
Some factors in the practical production were also considered, the die casting technology and main parameters were analyzed, consequently requirements of reasonable design of the fan blade transmissi…
从某一植物上切除一部分并用来繁殖出一棵新植物，如茎、叶或根，通过扎根或嫁接。
A part, such as a stem, leaf, or root, removed from a plant to propagate a new plant, as through rooting or grafting.
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