应该是lunches room,room of lunches,room for lunches,lunch room在
应该是lunches room,room of lunches,room for lunches,lunch room在词典里查时没有lunch room这种用法,paper's factory,是不是还可以写成paper of the factory?因为他们都是无生命的名词.还是说直接写成paper factory,没有复数形式.mountain area 是不是只有单数形式,字典里似乎例句里面没有复数形式.他可不可以写成area of the mountain