向海天：Captain Ahab:a monomaniac person who set out to destroy evil but only to be destroyed.he was passionate,powerful,self-righteous and single-minded.he stubbornly attached a moral quality to an amoral creature and launched a battle against it at the expense of his life as well as the lives of his crew.his first intention was to destroy Evil as represented by the white whale but in the end he became a devil who claimed the lives of the crew.