"三斤橘子" 用英语表达为 "Three jin of oranges".
"三斤" 是中文的重量单位，相当于3斤，约为3.3公斤。“斤”是古代重量单位，现在已经不常用。
"橘子" 用英语表示为 "oranges"。
例句：
"I bought three jin of oranges at the market this morning." (我今天早上在市场上买了三斤橘子。)
"I need to buy some oranges for my family, about three jin." (我需要为我的家人买点橘子，大约三斤。)