在跑道上跑步，每次直线快速跑约15秒，然后慢步跑剩下的直线距离，在开始下一次15秒大跨步跑之前转弯。
On a track, run quickly for about 15 seconds every time you start a straightaway, then ease off and jog the rest of the straightaway and the turn before beginning another 15-second stride.
教练让运动员绕着操场慢步跑。
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