It was traditionally a farm product, but with the advent of the cream separator in the late 19th century it began to be mass-produced.

传统上是农场生产的产品，但19世纪晚期，随着乳脂分离器的出现，奶油已可大量生产。

youdao

It was traditionally a farm product, but with the advent of the cream separator in the late 19th century it began to be mass-produced.

传统上是农场生产的产品，但19世纪晚期，随着乳脂分离器的出现，奶油已可大量生产。

youdao