At most 20% of protein in grains fed to animals is converted to edible protein; the rest is turned into waste products.

在用来饲养动物的谷物中，最多只有20%的蛋白质转化为可食用蛋白质，剩下的则变成废物。农。

This stuff, which is so low in nitrogen, so low in protein, they can turn into edible protein, and that's how they can form these vast colonies.

这是一种低氮、低蛋白的材料，它们却可以将其变为可食用蛋白，这就是为何它们能有如此巨大领地的原因。

This is waste which would typically just be thrown out in the trash by the poultry industry but now it's being turned into a lean source of edible protein.

这是家禽行业通常只会扔进垃圾桶里的废物，但现在它却变成了可食用蛋白质的瘦肉源。