蕨类植物

What recorded them were embryos of lichens, ferns, etc.

记忆它们的是地衣、蕨类植物等胚种。

Lycopodium alkaloids are those structurally related natural alkaloids isolated from Lycopodium, which often have the same biogenesis.

中文摘要石松生物碱是从蕨类植物石松及其近缘植物中分得的结构相似，具有相同生源的一类天然生物碱。

Cosmopolitan genus of ferns: maidenhair ferns; in some classification systems placed in family Polypodiaceae or Adiantaceae.

一个分布在世界各地的蕨类植物属；掌叶铁线蕨或铁线蕨；在一些分类系统种归入水龙骨科或铁线蕨科。

Vascular plants, related to modern seed plants and ferns, left the first comprehensive megafossil record.

与现代种子植物和蕨类植物有种属相关的微管植物，留下了一批巨化石记录。

He scanning electron microscopical investigation on the spore of some species of pteridophytes.

itle 几种蕨类植物孢子在扫描电子显微镜下的观察。

The scanning electron microscopical investigation on the spore of some species of pteridophytes.

几种蕨类植物孢子在扫描电子显微镜下的观察。

Stiff leathery-leaved fern of western North America having ovate fronds parted to the midrib.

叶子坚韧似皮革的蕨类植物，分布在北美西部，有卵形的叶子，中间有叶脉分开。

For plants, the situation is worse; 70 percent of all nonflowering plant species and 86 percent of flowering species are considered threatened.

而植物的情况就更糟了，70%的蕨类植物和86%的开花植物都频临灭绝。

Upon the Big Island, pine trees were also scarce; however the ferns and Ohia trees of the volcano provided this service; and so Mila would regularly venture to the volcano park in search of her next steps upon her path.

在这个大岛上，松树也是稀有的；然而火山的蕨类植物和桃金娘花树却提供这个服务；所以 Mila 常冒险去火山公园寻找她提升道路的下一步。

Upon the BigIsland, pine trees were also scarce; however the ferns and Ohia trees of the volcano provided this service; and so Mila would regularly venture to the volcano park in search of her next steps upon her path.

在这个大岛上，松树也是稀有的；然而火山的蕨类植物和桃金娘花树却提供这个服务；所以 Mila 常冒险去火山公园寻找她提升道路的下一步。

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。