A Venetian law decrees that all gondolas must be painted black. The only exceptio are gondolas belonging to high public officials. 威尼斯有一条法律,规定所有的平的小船都必须漆成黑色,只有高级官员的小船例外。
But "have already known insurance principle of exception" exceptio. 但是已知保险例外原则除外。