Behind the Heavy Door is the "Heavy" History

    In Yale, I find a funny thing: the doors are thick and heavy, making us difficult to pull and push.In fact, everything inside the teaching buildings are old and thick.We can have a strong sense of history. 

    Americans try hard to protect something old, not to destroy, not to reconstruct as we do.They have a strong sense of responsibility to protect historical things because history can tell behind these heavy doors.