1.
How did they become fossils?
它们是怎样变成化石的？
2.
fossil bones, shells, etc
变成化石的骨、 贝壳等.
3.
The little animals fossilized and are now embedded in the limestone.
这个小动物变成化石后并嵌入在石灰石里。
4.
To become stony, especially by petrifaction.
使变成石头使变成石头，尤指通过石化作用
5.
Chemical changes have made a great many plants into coal, oil, and gas.
化学变化使得大量植物变成煤、石油和煤气。
6.
To convert(wood or other organic matter)into a stony replica by petrifaction.
使石化使（木头或其它有机物）通过石化作用转变成为石质复制品
7.
The rock has weathered away into soil.
岩石经雨蚀风化而变成泥土。
8.
Animals and plants of remote antiquity turned to fossils.
远古的动植物变成了化石。
9.
Analysis of oil production and regional composition change of China in recent twenty years;
近20余年来中国石油产量及构成变化
10.
Changed in structure or composition as a result of metamorphism. Used of rock.
变质的因变质作用而导致的结构变化或成分变化。用于指岩石
11.
How can a rock become so changed as to turn into a completely new rock?
岩石怎么会发生如此大的变化，以至于变成为另一 种全新的岩石?
12.
an electromagnet (as on a tape recorder) that converts electrical variations into magnetic variations that can be stored on a surface a later retrieved.
能够把电的变化转变成磁性变化并储存在表面备用的电磁石。
13.
a geological change in the mineral content of rock after the rock has formed.
在岩石形成之后发生的岩石内矿物含量的地质变化过程。
14.
the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone.
使早期时代的植物、动物成为化石的过程；向石头转变的过程。
15.
Physically, the rocks break down into smaller and smaller pieces.
物理变化方面，岩石被分解成越来越小的碎片。
16.
To reduce(petroleum) to simpler compounds by cracking.
分馏，裂解通过挤压使（石油）变成更简单的化合物
17.
The Influence of Petrochemical Industry Engineering Project Construction Progress Change to Construction Cost;
石化工程项目施工进度变更对施工成本的影响
18.
The Study about Development Strategy of PetroChina Based on Changes in Oil Product Market;
基于成品油市场变化的中石油发展战略研究