catalyst

n. 催化剂，促使事情发展的因素

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, catacombs, catafalque, catalepsy, cataleptic, catalog, catalogue, catalogue (US also catalog), catalysis, catalytic, catalyze, catamaran, catapult, cataract, catarrh, catastrophe, catastrophic, catastrophically, catcall, catch, catch at, catch crop, catch fire, catch on, catch one's breath, catch one's eye, catch sb.'s eye, catch sight of, catch the eye,