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- Their fossil shells usually take the form of planispirals, although there were some helically-spiralled and non-spiralled forms (known as "heteromorphs"). 菊石化石外壳呈平旋形,不过也有螺旋上升形和非螺旋形(称为“异形”)。
- The coiled, flat, chambered fossil shell of an extinct mollusk belonging to the class Cephalopoda, which was abundant in the Cretaceous period. 菊石,鹦鹉螺化石已灭绝软体动物的螺旋形、扁平的化石外壳,属头足纲动物,大量存在于中生代
- one of the coiled chambered fossil shells of extinct mollusks. 一种已灭绝的头足类动物的化石脱壳。
- It is typified by the presence of multiple cavities that originally housed fossilized shells. 具有最初由化石化的贝壳而形成的多孔特征。
- one of the coiled chambered fossil shells of extinct mollusks 一种已灭绝的头足类动物的化石脱壳
- A tough,silicified limestone formerly used to make millstones. It is typified by the presence of multiple cavities that originally housed fossilized shells. 一种坚硬的,硅化石灰石,以前用来制作磨石。具有最初由化石化的贝壳而形成的多孔特征。
- A tough, silicified limestone formerly used to make millstones.It is typified by the presence of multiple cavities that originally housed fossilized shells. 磨石,砂质多孔石灰岩一种坚硬的,硅化石灰石,以前用来制作磨石。具有最初由化石化的贝壳而形成的多孔特征
- A tough, silicified limestone formerly used to make millstones. It is typified by the presence of multiple cavities that originally housed fossilized shells. 磨石,砂质多孔石灰岩一种坚硬的,硅化石灰石,以前用来制作磨石。具有最初由化石化的贝壳而形成的多孔特征
- He found a piece of fossil of an ancient bird. 他发现一块古代鸟类的化石。
- There is an ornament made of shells on the wall. 墙上有一个贝壳做成的装饰品。
- This fossil may be over 2 million years old. 这化石可能超过二百万年了。
- We found many beautiful shells on the shore. 我们在岸边找到了好多美丽的贝壳。
- The enemy's shells made great holes in the ranks. 敌人的炮弹在士兵行列中炸成大洞。
- Can you date the fossil exactly? 你能确定这化石的确切年代吗?
- Snails are usually served in their shells. 蜗牛通常连壳被端上餐桌。
- Shells were bursting all around. 炮弹在四处爆炸。
- Keep down of you'll be hit by shell fragments. 别起来,否则你会被弹片击中的。
- Winkle shells are abundant on this beach. 这个海滩上有大量的峨螺壳。
- The snail retreated into its shell. 蜗牛缩进壳里去了。
- Isn't Professor Bell an old fossil? 贝尔教授真是个老顽固。