。
She bought two pounds of butter.
Literal
She [topic-は] butter [object-を] two-pounds bought.
ポンド is a routine English-loanword for the Imperial weight unit, used in Japan when discussing American or British recipes, products, or measurements — Japan itself uses the metric system (グラム, キログラム) for everyday measurements. The bare-numeral measurement 二ポンド ('two pounds') sits unmarked next to the verb, like other quantitative expressions in Japanese: 三本 ('three bottles'), 五個 ('five pieces'). This is a classifier-counter pattern, the same that drives 一足 ('one pair') or 一個 ('one piece').