建筑学中，拱道或门口的拱心石，是把建筑整体连接在一起来防止它倒塌的石头。
In architecture, a keystone in an archway or doorway is the stone that holds the whole thing together, and keeps it from collapsing.
外壁的外皮被牢固地与整体连接，以较低楼层的建筑物整体连接。
The outer skin of the external wall is firmly connected with the overall building through its monolithic tie to the lower floors.
讽刺的是，现在宽带或多或少无处不在，整体连接速度也突飞猛进地增加，但加载页面的时间却越来越长。
The irony is that, with broadband nowadays more or less everywhere, overall connection speeds have gone up by leaps and bounds, yet the time taken to load web pages seems only to have got longer.
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