This book is dedicated to my kids,
without whom I never would have written it,
and to Kristen, because I always promised my first book would be for her.
Without her, there'd be no book.
这本书献给我的孩子们，
没有他们，我永远也写不出这本书，
也献给克里斯汀，因为我一直承诺我的第一本书会献给她。
没有她，就没有这本书。
