To have a general view of a mine through the field visit can be time, energy and financial consuming, which would also be restricted by the mine reality and underground workings.

实地参观并了解一个矿山的全貌，费时、费力、费财，且受矿山实际和井下工程的影响。

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Organisers also posted a message on the London 2012 ticketing website to say that seats bought after 17 July will have a restricted view.

BBC: London 2012 will show 'Britain can deliver', says PM