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| 1. | existing previously or before something. |
| 先前存在或者在某事物之前存在。 |
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| 2. | write new data on top of existing data and thus erase the previously existing data. |
| 在已有数据上再输入新的数据并将原有数据清除。 |
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| 3. | If previously existing rocks are subjected to high temperature, pressure and the chemical action of solutions |
| 如果早先已形成的岩石遭受到高温、高压以及气体和溶液的化学作用，这些岩石便会改变成与原岩完全不同的变质岩。 |
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| 4. | The process of change from any previously existing rocks into metamorphic rocks is called metamorphism |
| 将原来岩石改变成为变质岩的这种作用称之为变质作用。 |
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| 5. | igneous rocks which are formed from molten rock material, sedimentary rocks are made up of particles of previously |
| 沉积岩不像火成那样是由熔融的岩石物质形成，沉积岩是由早先存在的浆岩、变质岩和沉积岩的矿物碎屑及岩石屑组成的， |
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| 6. | Metamorphic rocks are any that have been changed from previously existing rocks by the action of heat |
| 经过温度、压力、化学反应对早先存在岩石的作用，可将原岩改造成变质岩， |
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| 7. | any sedimentary or metaorphic rocks may be partially melted to produce igneous rocks, and any previously |
| 沉积岩和变质岩可以局部熔融而形成岩浆岩;在造山运动中，任何一类岩石经挤压和蚀变而形成变质岩; |
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