英语run down the track 为什么要加down.run the track

用Track Down英语造句 please write down the (run) names here When I was on the track team,I used to run the quarter mile Even if you are the right track,you will get run over if you 英语翻译The train puffs down the track.The train whistles and st run down And handythumbtabs run down the side of the pages t some students may run down the stairs 对run down the stairs提问 Need to track down time on the machines for a better Total P look at the man——（run)down the street, be on the track join the track team Some students may run down the staris (否定句)