1·Metamorphic rocks form from the alteration of preexisting rocks by changes in ambient temperature, pressure, volatile content, or all of these.
变质岩是由先存岩石在周围温度、压力、挥发物含量、或所有上述因素都变化而发生蚀变而形成的。
2·Fractures themselves typically do not have much volume, but by joining preexisting pores, they enhance permeability significantly.
裂隙本身的特点是没有很大容积，但通过连接先存的孔隙，明显地提高渗透率。
3·The left-lateral strike-slip movement of the Zhongwei fault zone since late Pleistocene caused the differentiation of preexisting overthrust faults in the zone.
青藏高原东北缘的中卫断裂带在晚更新世以来的左旋走滑运动中，先存的挤压逆掩、逆冲断裂带发生了分化。
4·Coupling the acoustic emission probe with the specimen is the key link in the measurement of preexisting stress of the rock specimen by Kaiser effect.
以凯瑟效应测量岩石试样先存应力，声发射探头与试样的耦合是其重要环节。