bedrock

Đá mẹ, đá nền

the solid rock beneath the surface of the earth, especially when it is not covered by soil or other material

• the bedrock of somewhere

Collocations bedrock of the mountains · bedrock beneath the soil

• The bedrock under the city is very hard.

  Đá nền dưới thành phố rất cứng.

Cơ sở, nền tảng

the basic principles or facts that form the basis of something such as an idea, system, or organization

• the bedrock of sth

Collocations bedrock of democracy · bedrock of society

• The bedrock of a healthy relationship is trust.

  Cơ sở của một mối quan hệ lành mạnh là lòng tin.