What's the "xiezai" in English

What's the "xiezai" in English what's the “清华大学” in english? What's the longest word in English? What's the English in "床 What's the ___ ___this?(What's this in English?) what's the "姑且听之"in english? what's the meaning of"不必耿耿于怀"in English What's the definition of American Dream in English? What's the language _______ in New Zealand?--- English. What's the meaning of 'conversation' in English? What's this in English? What`s this in english?