bedrock

n [U] (a) solid rock beneath loose soil, sand, etc 松土、沙子等下面的坚固的岩石: reach/get down to bedrock 深及基岩. (b) (fig 比喻) basic facts or principles 基本的事实或原则: the bedrock of one's beliefs 基本信念.

become aware of, become used to, becquerel, bed, bed-linen, bed-wetting, bedaub, bedbug, bedclothes, bedding, bedeck, bedevil, bedfellow, bedlam, bedouin (also Bedouin), bedpan, bedpost, bedraggle, bedraggled, bedridden, bedroll, bedroom, bedside, bedsore, bedspread, bedstead, bedtime, bee, bee-keeper, bee-line, Beeb, beech, beef, beef tea, beefburger, beefeater, beefsteak, beefy, beehive, beekeeper,