您要查找的是不是：
- 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
- 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”）。
- Preliminary Study on the Fossil Shell Composition of Palaeozoic Era Brachiopodaa at Wudang Guiyang 贵阳乌当古生代腕足动物化石壳质成份的初步研究
- 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。
- Keep down of you'll be hit by shell fragments. 别起来，否则你会被弹片击中的。
- the coiled,flat,chambered fossil shell of an extinct mollusk belonging to the class Cephalopoda,which was abundant in the Cretaceous period 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
- The snail retreated into its shell. 蜗牛缩进壳里去了。
- Can you date the fossil exactly? 你能确定这化石的确切年代吗?
- A shell splinter embedded itself in the wall above his head. 在他头上方的墙壁上嵌有一块小小的贝壳片。
- The building was burned to a shell. 大楼被烧得只剩下空骨架。
- The despair left him a mere shell of a man. 他陷入绝望，形同躯壳。
- 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。
- She crumbled an empty snail shell in her fingers. 她用手指捏碎了一个空蜗牛壳。
- A snail's shell is spiral in form. 蜗牛壳是螺旋形的。
- Keep down or you'll be hit by shell fragments. 别起来，否则你会被弹片击中的。
- The building was destroyed by an artillery shell. 这座建筑物被炮弹炸毁了。
- 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
