二回羽状的

The leaf is bout or 2 Hui Yu shape are cracked greatly, lobation is fine, the bine is lower Xie Youbing, grow 2 – 3 millimeter, upside does not have a handle.

叶为一回或二回羽状深裂，裂片细，茎下部的叶有柄，长2–3毫米，上部无柄。

As a result of analysis to many of the results of experiment, checked up on specimens, field investigation and combining with the theories of palaeobotany, comparative morphology, evolutional morphology of vascular plants and taxonomy, it can be concluded as following: the primitive sorts of Cycadaceae are the sorts that pinnate leafs are dichotomy; among these, the sort that pinnate leafs are tripinnate-dichotomy is most primitive, from this sort gradually evolve to bipinnate-dichotomy, to only for monopinnate-dichotomy, from this sort evolve to the sorts that pinnate leafs are simply pinna; among the sorts of simply pinna, the species that segments of megasporophyll possess much more triplicate to monodichotomy are most primitive.

经过大量的实验结果分析、查阅标本和野外调查，结合古植物学、比较形态学、演化植物学和分类学等理论进行分析，认为苏铁科原始的类型为羽叶呈二歧状分叉的种类，其中最原始的又是羽叶呈三回二歧状分叉的种类，从这个羽叶类型逐渐演化出一回二歧状分叉的羽叶类型，再演化出羽叶为单羽状的类型；而单羽状叶的类群中，又以大孢子叶侧裂片具三回、二回及一回二歧状分叉数量多的种类为最原始，而侧裂片二歧状分叉数量少的为较进化，侧裂片无二歧分叉的如拳叶苏铁类为最进化的种类。

Slender fern of northern North America with shining chestnut-colored stipes and bipinnate fronds with usually distinct marginal sori.

具有亮褐色叶柄和二回羽状复叶并通常带有边缘孢子群的一种北美洲北方的细长蕨类。

Tree ferns of temperate Australasia having bipinnatifid or tripinnatifid fronds and usually marginal sori; in some classification systems placed in family Cyatheaceae.

分布于温带澳大拉西亚的树蕨，叶二回羽状分裂或三回羽状分裂，囊群位于叶的边缘；在一些分类中归入桫椤科。

Tropical South American tree having a wide-spreading crown of bipinnate leaves and coiled ear-shaped fruits; grown for shade and ornament as well as valuable timber.

南美热带地区的一种乔木，具有茂盛的二回羽状复叶，果卷曲，耳状；具有遮荫，装饰作用，木材价值高。

Any of various mostly tropical herbs, shrubs, and trees of the genus Mimosa, having globular heads of small flowers with protruding stamens and usually bipinnate,''.

含羞草一种含羞草属的多种热带草本植物、灌木及乔本植物，开球状小花，花蕊突出，通常生有二回羽状复叶，对触模和光很''。

Any of various mostly tropical herbs, shrubs, and trees of the genus Mimosa, having globular heads of small flowers with protruding stamens and usually bipinnate, compound leaves that are often sensitive to touch or light.

含羞草一种含羞草属的多种热带草本植物、灌木及乔本植物，开球状小花，花蕊突出，通常生有二回羽状复叶，对触模和光很敏感注意，注意力集中

Any of various mostly tropical herbs, shrubs, and trees of the genus Mimosa, having globular heads of small flowers with protruding stamens and usually bipinnate, compound leaves that are often sensitive to touch or light.

含羞草一种含羞草属的多种热带草本植物、灌木及乔本植物，开球状小花，花蕊突出，通常生有二回羽状复叶，对触模和光很敏感

A widespread weed having rank-smelling, bipinnately divided leaves and white-rayed flower heads.

臭甘菊一种遍生的野草。有腐臭味、二回羽状分叶和发白色光的花冠

Leaves pinnate or sometimes ternate or simple , rather leathery .

叶子呈羽状或二回三出的复叶或是单叶，相当坚韧。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。