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costlier , costliest
If you say that something is costly, you mean that it costs a lot of money, often more than you would want to pay.
expensive
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？
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。