to ask; to invite; please (do sth); to treat (to a meal etc); to request[cedict]
按
ànㄢˋ
to press (with the hand); to push; to control; to restrain; to check; pressing down (brush movement in painting); according to; in the light of[cedict]
三
sānㄙㄢ
three; 3[cedict]
键
jiànㄐㄧㄢˋ
(door lock) key; key (on piano or keyboard)[cedict]