Only with the rise of the Space Shuttle programme in the early 1980s, and the dissolution of the Soviet Union a few years later, did America retake the crown.

直到20世纪80年代初航天飞机计划的兴起以及没几年后苏联的解体，美国才重获该领域的主导地位。

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The compactionand secondary enlargement of quartz lead to the great decrease of primary porosity of clastic rocks, and dissolution is contributed to the formation of secondary pore space.

压实作用和石英的次生加大使碎屑岩的原生孔隙度极大的降低，溶解作用是次生孔隙形成的主要因素。

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In addition, dissolution of grain dolostone also occurs and shows the characteristics of hypergene dissolution in some places, which may contribute to the development of reservoir space.

另外，局部可见颗粒白云岩发生溶蚀，有些地方具有表生溶蚀作用的特点，对白云岩储集空间的发育有一定贡献。

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