tertiary

He must have come to know those philosophers through secondary or tertiary sources..他一定是通过第二手或第三手资料了解那些哲学家的。

tertiary industry,第三产业

tertiary education,高等教育，大学教育

tertiary amine,[化]叔胺；三级胺

tertiary recovery,三次开采；强化采油

tertiary period,[地质]第三纪

tertiary treatment,三级处理

tertiary sector,第三产业（服务业）；第三产业部门

tertiary structure,[化]三级结构

tertiary butyl alcohol,叔丁醇；第三丁基醇