最近已经研制出一种动物食用的蛋白质饲料，它是用石油作为基本原料加上酵母而制成的。

Recently protein feeds for animals have been developed by growing yeast in a petroleum based stock.

youdao

最近已经研制出一种动物食用的蛋白质饲料，它是用石油作为基本原料加上酵母而制成的。

Recently protein feeds for animals have been developed by growing yeast in a petroleum based stock.

youdao