The Games begin when a runner, carrying a lighted torch brought from Greece, reaches the stadium.

当一位运动员把一支从希腊点燃的火炬送到体育场时，运动会立即开始。

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From Tuesday morning, 6.6 million Olympic tickets become available, 500 days before the Games begin.

BBC: 2012 clock starts counting down as tickets go on sale

All of which makes Olympic success far from guaranteed, but this is the year in which the proud Yorkshireman can begin to make his mark on the Games.

BBC: Sport - Alistair Brownlee ready for crucial Olympic qualifying year