苏铁类

Ginkgo and cycads are the only two lineages bearing multiflagellated spermatozoids in all extant seed plants.

银杏和苏铁类植物是现存种子植物中仅有的2个具多鞭毛游动精子的类群。

The seed-ferns declined, and there was a great increase in the number and diversity of cycads, palmlike gymnosperms, and conifers.

种子蕨趋于减少，而苏铁类、指状裸子植物和球果类，无论是多样性还是在数量上都有大幅增长。

The initiati on and development of archegonia in Gingko,compared with those of cycads, w ere liked to be more primitive at the evolutional level.

银杏雌配子体及颈卵器的发生与发育，和苏铁类植物比较，在演化程度上可能更为原始。

We compared the reproductive characters of Ginkgo and cycads based on literatures, and found that Ginkgo and cycads have many differences in embryo development.

本文综述了近年来银杏和苏铁类植物在生殖生物学方面的研究进展，比较了它们生殖特征的异同，并对它们间的亲缘关系进行了初步探讨。

Cycads are plants extending back 250 million years to the early Permian period, before dinosaurs roamed the Earth.

苏铁类植物是可追溯二点五零亿年以早二叠纪时期，在恐龙出没的地球。

Cognized to vessel of cycads,help us to understand the mechanism which these most primitive seed plants extant how to adapted to harsh environments and their evolutionary level,and has significance to use efficiency measure protect these rarity plants and has significance to plant anatomy,plant systematics and plant evolution.

对苏铁类植物导管的认识，对于我们进一步了解现存最原始的种子植物对严酷环境的适应机制和进化状况，对于采取有效措施保护这些珍稀的植物类群，以及对于结构植物学、植物进化和生态学等研究方面均具有重要的意义。

Frond A term usually applied to large well-divided leaves as found in ferns, palms, and cycads.

大形叶，叶状体：该术语通常指蕨类植物、棕榈以及苏铁类所具有的大型的、分裂明显的叶。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。