a dime a dozen 字面意思“一毛一打”，一毛能买一打，可想而知，东西是多么地便宜，它可以意为“不值钱，很普遍，毫无价值，很容易”，寓意：
something very common and not having much value很普通但没有什么价值的东西 something that is abundant, cheap and very common物产丰富，价格便宜而且很普通的东西 so plentiful as to be valueless如此丰富以至于毫无价值 something that is easily acquired容易获得的东西
例如： Adventure and traveling based reality shows are now outdated and a dime a dozen.基于冒险和旅行的真人秀现在已经过时且毫无价值。 Websites on health and fitness are a dime a dozen nowadays, but not all of them are accurate and have correct information.如今，有关健康和健身的网站可谓五花八门，但并非所有的网站都是准确和拥有正确的信息的。 Low paying jobs are a dime a dozen and anyone can get one if they try, but the high paying ones are not so easy to get and require proper and relevant skills.低收入的工作很普遍，任何人想找的话，都可以找到一份，但高薪工作并不那么容易，需要适当的相关技能。
Coaching classes are a dime a dozen, but most of them are of low quality and do not deliver on their promise. The really good ones are far fewer.辅导班很普遍，但大多数课程质量不高，没有兑现承诺。真正好的相当地少。 Cheap watches like this have flooded the market. You can get them a dime a dozen.像这样的廉价手表充斥着市场。你可以很容易买到。
Small local music bands are a dime a dozen. Groups of youngsters form these bands dreaming of making it big someday.小规模的地方音乐乐队非常普遍。一群年轻人组成这些乐队，梦想着有朝一日能做大。 看完这篇文章后，又学会了一种表示不值钱的表达方式，以后若想表示什么东西没价值或是很普遍，可以简单地这样表达： It's a dime a dozen.
