strata

Địa tầng, lớp đất đá

a layer of rock or soil that is part of a series of layers in the ground

• strata of something

Collocations strata of rock · strata of soil

• The strata of rock were clearly visible in the cliff face.

  Các lớp đá trong vách núi rất rõ ràng.

Nhóm xã hội, tầng lớp

a group or level of society that is different from other groups in terms of wealth, education, and so on

• strata of society

Collocations social strata · economic strata

• The country's social strata are becoming more fluid.

  Các tầng lớp xã hội trong nước đang trở nên linh hoạt hơn.