sealed off

The change from the unroofed stadiums to sealed off buildings maybe the beginning that tickets were sought.

从露天场馆到封闭的建筑的转变，就可能是追求入的开始。

The amphitheater was a sealed off round structure. Swordplay, wresting, gladiatoral and other contests were held there.

该竞技场为四周封闭式结，可以举行斗剑、格斗、斗兽及其他竞赛。

Seal off the edgefold by using a new special heat-pressing technology, enhance prevention of side leakage.

有的新型热压密封折边技术，更加有效的防止侧漏，使用更加放心。