A three-decker apartment house; double-decker buses.
一所有三层公寓的房子；
2
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。
3
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.