cost an arm and a leg/a small fortune idiom (UK also cost a bomb/the earth/a packet)
极其昂贵;花一大笔钱
to be extremely expensive
I'd love to buy a Porsche, but they cost an arm and a leg. 我倒是想买辆保时捷，可实在太贵了。
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。