Write all the keywords belonging to the movie 'Sky Captain and the World of Tomorrow.'
keywords refers to keyword_name; movie 'Sky Captain and the World of Tomorrow' refers to title = 'Sky Captain and the World of Tomorrow'
SELECT T3.keyword_name FROM movie AS T1 INNER JOIN movie_keywords AS T2 ON T1.movie_id = T2.movie_id INNER JOIN keyword AS T3 ON T2.keyword_id = T3.keyword_id WHERE T1.title = 'Sky Captain and the World of Tomorrow'