expensive adj. 花费的，昂贵的
例句：I think international calls are very expensive.
我认为国际电话费用很高。

costly adj. 昂贵的，贵重的，代价高的
例句：The costly renovation of the old college building was criticized by most students.
花费很大的旧校舍的修复工程受到大多数学生的批评。

extravagant adj. 奢侈的，浪费的，过分的，放纵的
例句：Simon's eldest son was careless and extravagant.
西蒙的大儿子是个无所用心、挥霍无度的人。

luxury n．奢侈，华贵
例句：Hellen has lived in luxury all her life.
海伦一生生活奢侈。

luxurious adj. 奢侈的，豪华的
例句：The interior of the building is magnificent and luxurious.
大楼内部装饰得很奢华。