a dime a dozen very common and of no particular value. US informal
☞ A dime is a small US coin worth ten cents which occurs in various US expressions as a metaphor for cheapness or smallness.
1998New Scientist Of course, medical breakthroughs are not a dime a dozen.
英语词组固定搭配大全包含15956条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。