It is necessary to clarify one thing; The architectural style for any period is the mainstream, but not the only style. There is overlapping where some trends have not yet run their course, and no clear dividing points.
必須說明的是，每個階段的建築風格是該時期的主流，但並非唯一；不同風格的建築在興起沒落間，也有重疊，並非壁壘分明。