Literal translation
oh, how beautiful that is!
Meaning
oh, how beautiful!
Explanation
An exclamation of admiration built on the same demonstrative acò (that) found in qu'es acò, followed here by the elided verb to be 's and the adjective bèu, beautiful. The interjection oh opens the sentence to mark surprise or wonder, before the construction states the aesthetic judgment plainly and directly: that is beautiful. The phrase belongs to the register of spontaneous exclamation, the kind used before a landscape, a work, a child, or anything that provokes immediate admiration. Its grammatical simplicity, reduced to a demonstrative, a copula and an adjective, makes it a reflex sentence, uttered without preparation, and it is precisely this economy of means that carries the intensity of the feeling expressed. The adjective bèu regularly shifts to bello in the feminine, following the ordinary rules of Provençal adjectives.