The laboratory researchers are also grappling with what happened to the lead roof.

实验室研究人员也在努力解决铅屋顶发生的问题。

The lead roof and the wooden timbers that supported it were mostly gone, and there were holes in the vaulted stone ceiling.

铅皮屋顶和支撑它的木头大部分都不见了，拱形石天花板上有洞。

By what seemed the special interposition of a considerate Providence she tottered to the inner edge of the parapet instead of to the outer, and reeled over upon the lead roof two or three feet below the wall.

似乎是出于体贴的天意的特殊干预，她摇摇晃晃地走到了护墙的内缘，而不是外缘，然后在墙下两三英尺的铅屋顶上摇摇晃晃地翻了个底朝天。