hey! / (interjection used to attract attention or to express surprise or disapprobation)
哎
=
口
+
艾
:
Albert Einstein (Ø) wants to warn the public about the dangers of aids (艾). In front of the airplane (ai1) he dresses as a mandarin (口) and shouts "hey!" (哎) at the people to get their attention.
哟
=
口
+
约
:
Maud Younger (y) is going to go on a date (约). To freshen up her breath she eats a mandarin (口) in front of the observatory (o1), but she accidentally swallows the mandarin whole and exclaims "哎哟" out of pain and surprise (哟).