concrete 指通过感官能看到、听到、触到的具体东西。其反义词是abstract。
specific 侧重指具体的细节，是与general(一般)，vague(模糊)相对的具体。
参考例句
1. Application software performs specific tasks for the user. 应用软件为用户完成具体的任务；
2. In painting art, the expressed most specific theme and image is often the most abstract thinking. 在绘画艺术中，最具体的主题和形象所表达的往往是最抽象的思想。
3. The purpose of education should be to provide students with a value system, a standard, a set of ideas—not to prepare them for a specific job. 教育的目的在于为学生提供一个价值体系，一种标准，一整套思想，而不是让他们为某一种具体的工作作好准备。
英英解释
n.
1. a fact about some part (as opposed to general)
2. a medicine that has a mitigating effect on a specific disease adj.
1. (sometimes followed by `to') applying to or characterized by or distinguishing something particular
2. stated explicitly or in detail
3. relating to or distinguishing or constituting a taxonomic species
4. being or affecting a disease produced by a particular microorganism or condition; used also of stain
