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Once they arrive at the location, each section is lifted by crane directly to the top of the building, which is assembled like toy Lego bricks.

当他们到达目的地时，每一节都被起重机直接吊到楼顶，就像玩具乐高积木一样被组装起来。

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The crane's top is about 1, 000 feet up.

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Then my husband and I realised that the top of the crane was gone.

BBC: London helicopter crash: 'Flaming debris' over Vauxhall

"The top off the crane also came off in the impact, " he said.

CNN: 2 killed as helicopter crashes into crane in central London