bedrock
noun uk/ˈbed.rɒk/ us/ˈbed.rɑːk/
(ROCK)
[ U ]基岩
the hard area of rock in the ground that holds up the loose soil above
(BASE)
[ S ]基础
the main principles on which something is based
Some people believe that the family is the bedrock of society. 一些人认为家庭是社会的基础。