求翻译：　在伦敦奥运会倒计时1周年活动上，伦敦当局在特拉法加广场发布了2012伦敦奥运会的奖牌设计。 　　本次奥运会的金、银、铜奖牌是由英国艺术家大卫-沃特金斯设计的，奖牌的直径为85毫米，重量高达400克，其重量要大大高于以往大部分奥运会的奖牌，在夏季奥运会中最重的，很多运动员可能因此需要在回程时支付更多的行李运费。是什么意思？

On the London Olympics countdown anniversary of the authorities in London in Trafalgar Square has released the 2012 London Olympics medal design. Gold, Silver and Bronze medals in the Olympic Games, designed by British artist David - Watkins medals was 85 mm in diameter, weighing up to 400 grams, it

At the London Olympics countdown 1 anniversary, London in Trafalgar Square publishing in 2012 of the London Olympic Games medal design. This time the Olympic Games gold, silver, and bronze medals from the British artist David Watkins - design of the medal, a diameter of 85 mm, the weight up to 400 g

　In the London Olympic Games countdown 1st anniversary activity, the London authority added the square in the Tela law to issue 2012 London Olympic Games' medal design. 　　This Olympic Games' gold, the silver, the copper medal are design by English artist David - Watkins, the medal diameter is 85 mil

　On the annual activities of the countdown to the Olympic Games in London 1, London, Trafalgar Square publishing, the administration of the 2012 London Olympic Games medal design. The gold, silver and bronze medals of the Olympic Games is the United Kingdom artist-David Watkins design, Medal of 85 m