unaltered

形容词 unaltered:

1. remaining in an original state
   同义词：unchanged

1. The third-deepest soil zone in ABC soil, unaltered by weathering and made up of the parent rock from which the two uppermost layers derive as well as other mineral materials.
   剖面层ABC土壤剖面层中深度排第三的剖面层，不受风化的影响，由上两层及其他矿物组成的母岩所构成