夏季奥运会最长的田径项目是50公里竞走，比马拉松距离还长大约5英里。

The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon.

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4月16日至4月20日，竞走、马拉松、花样游泳和击剑等4项赛事将分别在国家体育场、国家游泳中心和国家会议中心击剑馆举行。

Four test events - race-walking, marathon, water ballet, and fence-play - will be held respectively at the Bird's Nest, water Cube and National Conference Center's Fencing Gymnasium on April 16-20.

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此外，马拉松与长距离竞走项目是在体育场外公路上进行的。

As to marathon and long distance walking events, they would take place outside the stadium on road.

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