書太小看不到，可以按這裡，感謝您！If the book is too small to you, You can click here. Thank you a lot.

！！另一個方式是，在書的上下方空白處，用手指可滑動螢幕，或放大縮小。

！！Another way to do it is to move touch the screen “above or below” the blank place of the book. You will be able to enlarge or shrink the book.