... 群 cluster 街区层 stratum of blocks 分层抽样 stratified sampling ...
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When the dip of bedding is less than the friction Angle of rock, the rock stratum will separate and some rock blocks in every rock stratum may slide along joint surface as a whole.
当床上用品的倾角小于岩石内摩擦角，岩层分离和一些岩石块，在每一块岩石地层滑动沿节理面作为一个整体。
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