虎牙少年兔牙少女
[hŭ yá shăo nián tù yá shăo nǚ]
Describes a boy with sharp 'tiger teeth' and a girl having smaller front 'rabbit teeth'; these traits are associated with specific facial appearances. The contrast highlights unique characters or appearances, possibly pointing out the charm or appeal in diverse personal features, emphasizing the natural beauty in every type of individual.