... coalition theory 集合理论 zajedno coalition 合作同盟; 在一起联盟 coalitey rashings 软页岩 ...
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低抗压强度的软地层，如泥岩。石膏。盐岩。软页岩。软石灰岩。砂岩。
Low compressive strength of the soft formation, such as mudstone, gypsum, gypsum, soft shale, soft limestone, sandstone.
低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。
Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale, which is a soft rock and was obviously formed by being deposited on the sea bed.
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