cost 英[kɒst] 美[kɔ:st]
n. 价钱，代价; 花费，费用; 牺牲; [用复数][法律] 诉讼费;
vi. 价钱为，花费; 估计成本;
vt. 付出代价; 估价; 使丧失; 使付出努力;
[例句]The cost of a loaf of bread has increased five-fold
一条面包的价钱增长了4倍。expensive英[ɪkˈspens] 美[ɪkˈspɛns]
n. 费用; 花费的钱; 消耗; 花钱的东西;
vt. 向…收取费用; 把…作为开支勾销;
[例句]He's bought a specially big TV at vast expense so that everyone can see properly
他花大价钱买了一台特别大的电视机，这样每个人都能看清楚。
cost(n,费用，价钱，v花费)，expensive只能作形容词，意思为昂贵的
