Costly modifications设计修改难
costly love奢华的爱
costly repair高花费的修理
costly problem花很多钱才能解决的问题
Otherwise costly否则成本高了
costly amusement昂贵的娱乐活动
costly materials昂贵的材料
ADJ（形容词） If you say that something is costly, you mean that it costs a lot of money, often more than you would want to pay. 昂贵的
Having professionally made curtains can be costly, so why not make your own?
买专业制造的窗帘可能很贵，你为什么不自己做呢？