"一公斤苹果" 用英语说是 "a kilogram of apples"。
"Kilogram" 是 "公斤" 的英语翻译，来自法语 "kilogramme"，是一种质量单位。
例句：
"I bought a kilogram of apples at the farmer's market." (我在农贸市场买了一公斤苹果。)
"A kilogram of apples is about 2.2 pounds." (一公斤苹果大约是 2.2 磅。)
"Can you please weigh these apples? I need a kilogram of them." (请问你能称一下这些苹果吗？我需要一公斤。)