您要查找的是不是：
- genus of Carboniferous fossil ferns. 石炭纪的一个蕨类植物化石属。
- The ground was covered with ferns. 地面上长满了羊齿植物。
- Ferns reproduce (themselves) by spores. 蕨类植物用孢子繁殖。
- The hillsides are covered with ferns. 山坡上长满了蕨类植物。
- He found a piece of fossil of an ancient bird. 他发现一块古代鸟类的化石。
- This fossil may be over 2 million years old. 这化石可能超过二百万年了。
- An area overgrown with this fern. 欧洲蕨林被这种蕨覆盖的地带
- The trunk of a palm or tree fern. 棕榈树或树蕨的树干
- Can you date the fossil exactly? 你能确定这化石的确切年代吗?
- fossil ferns 化石蕨类
- Isn't Professor Bell an old fossil? 贝尔教授真是个老顽固。
- A microscopic fossil, as of a pollen grain or unicellular organism. 微体化石一种微小的化石，如花粉粒或单细胞有机体的化石
- If we squander our fossil fuels, we threaten civilization. 如果我们浪费矿物燃料，我们就威胁文明。
- North American fern with a blackish lustrous stipe. 带有光亮叶柄的一种北美蕨类。
- The gossip tossed the mossy blossom fossil. 爱讲闲话者向上抛长满苔藓的花化石。
- The seed ferns included treelike forms. 种子蕨类植物包括树状类型的植物。
- A finite list of choices; our finite fossil fuel reserves. 为数有限的选择; 我们有限的矿物燃料贮量
- Asiatic fern introduced in America. 亚洲引进的一种美洲蕨类。
- The solid matter in which a fossil or crystal is embedded. 基质，脉石嵌有化石或水晶的固体物质
- North American fern with evergreen fronds. 长有常绿复叶的北美蕨类。
