"Pretty girl" is a common Engpsh phrase used to describe a girl who is attractive and good-looking. The word "pretty" is an adjective that means "pleasing to the eye or to the ear."

Here are some example sentences and their translations in Chinese:

She is a pretty girl with a lovely smile. (她是一个长得很漂亮、微笑甜美的女孩。)
That pretty girl over there caught my eye. (那个在那边的漂亮女孩吸引了我的目光。)
He fell in love with the pretty girl at first sight. (他一见钟情于那个漂亮的女孩。)

It is worth noting that physical appearance is subjective and beauty pes in the eye of the beholder. In Engpsh, it is also common to use other adjectives to describe someone's appearance, such as "gorgeous," "stunning," "beautiful," "handsome," etc. The choice of adjective depends on the speaker's personal preferences and cultural background.