Poorly built or badly maintained structures often giveway due to incessant rains.

连绵不断经常会致使质量低劣或维护不善楼房发生倒塌。

In the second half of twentieth century, the development of Megalopolis has been the mainbody of American urbanization.

摘要20世纪后半期，大都市连绵带发展为美国城市化主要内容。