catacombs

n [pl] series of underground tunnels with openings along the sides for burying the dead (as in ancient Rome) 地下墓穴（如古罗马的）.

castration, casual, casually, casualness, casuals, casualty, casualy, casuist, casuistic, casuistically, casuistry, casus belli, cat, cat burglar, cat out of the bag, cat's-cradle, Cat's-eye, cat-o-nine-tails, cataclysm, cataclysmic, catafalque, catalepsy, cataleptic, catalog, catalogue, catalogue (US also catalog), catalysis, catalyst, catalytic, catalyze, catamaran, catapult, cataract, catarrh, catastrophe, catastrophic, catastrophically, catcall, catch, catch at,