A three-decker apartment house; double-decker buses.

一所有三层公寓的房子；

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The connected components form a three-tiered system that looks like a triple-decker sandwich.

这些连接起来的三层式的系统，看起来像个三层的三明治。

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That morning, three bombers detonated themselves in three of London'sUnderground trains, before a fourth explosion occurred on adouble-decker bus in Tavistock Square an hour later.

那天早晨，3名炸弹人分别在三列不同的伦敦地下铁列车上引爆了自己，紧接着一小时后，在塔维斯托克站的一座双层巴士上发生了第四次爆炸性袭击事件。

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LONDON, England (CNN) -- As Friday dawns in London, investigators are picking through the carnage created by a coordinated bomb attack on three of the city's Underground trains and a double-decker bus.

CNN: Investigators pick through London carnage