middle-distance
adjective /ˌmɪdl ˈdɪstəns/
  /ˌmɪdl ˈdɪstəns/
 [only before noun] (sport- connected with running a race over a distance that is neither very short nor very long(赛跑)中距离的 - a middle-distance runner (= for example, somebody who runs 800 or 1500 metre races)中距离赛跑选手(如 800 米或 1 500 米跑选手) 
 Collocations DictionaryMiddle-distance is used with these nouns:- event
- runner
- running
- …
 
- a middle-distance runner (= for example, somebody who runs 800 or 1500 metre races)