我们选择进行越野赛跑。
光化学氧化剂一直与健康的越野赛跑运动员的成绩下降有关。
Photochemical oxidants have been associated with impaired athletic performance in healthy cross-country runners.
观看他们的比赛感觉棒极了，无论是击剑还是越野赛跑，美式足球还是篮球。
Wathching an Ivy League game is wonderful, whether it's fencing, cross-country running, American football or basketball.
14日，一年一度的英国“人与马越野赛跑”在威尔士中部举行，赛程途经三座山峰和两条河流，其中最高峰海拔约500米，总赛程约35.4公里。
A man came in a close second after powering over 35.4 km, 2 rivers and 3 mountains - one a 500 altitude - during the annual Man Versus Horse race in central Wales on June 14.
那是九月初的一天，天气凉爽而又晴朗，正是赛跑的好日子。我参加了一项10.5英里的越野赛跑，才跑了最初几英里；整个赛程要穿越若干陡峭耗人体力的山坡。
It was an early September day, cool and bright and just right for running, and I was in the first few miles of a 10-mile race over a course through steep, exhausting hills.
那是九月初的一天，天气凉爽而又晴朗，正是赛跑的好日子。我参加了一项10.5英里的越野赛跑，才跑了最初几英里；整个赛程要穿越若干陡峭耗人体力的山坡。
It was an early September day, cool and bright and just right for running, and I was in the first few miles of a 10-mile race over a course through steep, exhausting hills.
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