说维多利亚女王的.
Neithershenoranyoneelsehaseverseenanythinglikethisbuildingbefore.Agreenhouse,thesizeofapalacewithadifferencethatthisisfromthebeginning,apeople'splace.ApopularmagazinecallsittheCrystalPalace.Itsgrandeurspacesarefillednotwithcourtiersandflunkies,butsteampumpsandlocomotives,ahugeshowcaseforbritain'sindustialempire.Just3yearsbefore,in1848,Europehadbeentornapartbyrevolutions.Thegovernmenthadfearedthesamewouldhappenhere.这段话中其中有一句Agreenhouse,thesizeofapalacewithadifferencethatthisisfromthebeginning,apeople'splace.
这里的为什么要有个this,这个that引导的是一个什么从句.