。
There are two pounds of butter in the refrigerator.
Literal
Refrigerator [of-の] inside [in-に] butter [subject-が] 2 pounds there-is.
The 'exists' structure [location]に[thing]がある. バター (butter) + 2ポンド (two pounds) where ポンド is the loanword for the Anglo-American weight unit. Japan officially uses kilograms, so pounds show up mainly in translations or international contexts. Note that the quantity 2ポンド functions adverbially without a particle, modifying ある.