英语视频听力：奥运项目跨栏

（单词翻译:单击）

Every athlete battles mental barriers. But this Olympian must defeat physical barriers too: all ten of them!

　　Hi, I'm Dr Greg Wells. Hurdlers are incredible multi-taskers. They have to be. Taking off like they've been shot from a cannon¹, they must somehow maintain enough control to soar, smoothly², over barriers about a metre high, in rapid succession.

　　So, how do they pull it off? When most of us run, our femur moves through a small range of motion in the hip³ socket⁴ -and in just one direction. But hurdlers train to move their femurs differently: they have twice the range of motion, and rotate in a circle at the same time!

　　The secret is a special stomach muscle called the psoas. It runs from your thigh⁵ bone, through your stomach, and up your lower back. Hurdlers lengthen⁶ and strengthen their psoas muscle. That lets them whip their trail leg through the entire range of motion with incredible speed.

　　The average person can run 7-10 km/h, but the unique combination of strength and flexibility⁷ enables an Olympic hurdler to hit up to 30! The fusion⁸ of hip motion and muscle recoil⁹... That's how you leap to gold!

　　中文字幕：

　　每位运动员都要克服心理障碍。而这位奥运选手还必须克服实际障碍，共有十个之多。

　　我是维尔斯博士。跨栏选手是神奇的多面手，他们必须做到。他们起跑犹如炮弹，但又必须保持足够控制力，才能顺畅地越过约一米高的障碍物，一个接一个。

　　他们是怎么做到的呢？我们跑步时，大腿的股骨在髋臼内作小幅度的运动，而且只朝一个方向。但跨栏选手股骨的运动有所不同，活动幅度达常人两倍，同时还可以打圆圈。

　　秘密在于腹部一块叫腰肌的特殊肌肉。腰肌从大腿骨经腹部连到下背部。跨栏选手把腰肌练得更长更强，让他们的跟进腿能以惊人速度，跨出大幅度动作。

　　一般人跑速是每小时7到10公里，而奥运跨栏选手结合劲力和灵活度，可以达到时速30公里。髋部运动加上肌肉回弹，就是夺金之道！