求翻译：到本世纪末，世界上的大城市将达21个，大城市里的生活条件将进一步恶化：拥挤、水被污染、卫生条件差、无安全感——这些大城市的无序扩大也损害到了自然区。因此，无限制的城市化应当被看作是文明的新弊端。是什么意思？

The end of the century, the world's large cities will reach 21, living conditions to deteriorate further in a big city: crowded, water pollution, poor sanitation, no sense of security – the big cities of disordered extended also damage to the natural areas. Therefore, an unlimited amount of new weak

正在翻译，请等待...

To the end of, in the world big city will reach 21, in the big city living condition further will worsen: Crowded, the water is polluted, the hygienic condition difference, does not have security sense - - these big cities the disorder to expand also harms the natural area.Therefore, the unlimited u

The end of the century, the world's large cities will reach 21, living conditions to deteriorate further in a big city: crowded, water pollution, poor sanitation, no sense of security – the big cities of disordered extended also damage to the natural areas. Therefore, an unlimited amount of new weak

正在翻译，请等待...