From the 1970s up to now, more than 10 domed stadiums have been built in the US. Both past and present, certain background conditions have existed allowing the development of such enormous stadiums.
從六○年代至今，美國本土已有十個巨蛋，而無論過去或現在，美國能發展出如此多的巨蛋建築有其背景。