amphi·theatre(especially
US-ter)BrE/ˈæmfɪθɪətə(r)/NAmE/ˈæmfɪθiːətər/nouna round building without a roof and with rows of seats that rise in steps around an open space.Amphitheatreswere used especially in ancient Greece and Rome for public entertainments.（尤指古希腊和古罗马的）圆形露天剧场，圆形露天竞技场a room, hall or theatre with rows of seats that rise in steps阶梯式座位大厅（或剧场、室）(specialist)an open space that is surrounded by high sloping land圆形凹地
