fundament
名词 fundament:
the fundamental assumptions from which something is begun or developed or calculated or explained
同义词:basis, base, foundation, groundwork, cornerstone
the fleshy part of the human body that you sit on
同义词:buttocks, nates, arse, butt, backside, bum, buns, can, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass
lowest support of a structure
同义词:foundation, base, foot, groundwork, substructure, understructure