editing.
Letters keys: to input letters
Shift: use with letter keys to input capital letters.
Enter: Confirm or turn to next line.
Numeral keys: affirm the term under cursor; to enter new
doing file editing; to enter number during the text editing;
shortcut key under text page/image display/ browser:
Key 1: auto turn page
Key 2: go to…
Key 3: to catalog
Key 4: add/delete bookmark, long press to bookmark
listing page
Key 5: to the memo function.
Key 6: rote
Key 7: zoom in
Key 8: zoom out
Key 9: dictionary
Key 0: on/off text speech
