Animal byproducts like meat and bone meal, leftover grease from restaurants, and even meal made from poultry feathers.

动物的副产品，比如肉和骨粉，餐馆里剩下的油脂，甚至是羽毛制成的食物。

The researchers cut a hole into the skull of the human remains and removed DNA from bone powder.

研究人员在这具遗骸的头骨上切开一个洞，从骨粉提取出了DNA。

Cattle production also produces beef tallow or fat and bone meal fertilizer.

牛只生产过程还会产生牛脂或脂肪以及骨粉肥。

Archaeologists in China have been exploring the ways people used bone powder in cuisine roughly 8,000 years ago.

考古学正在探索大约8000年前人们如何在烹饪使用骨粉。

The following day, what we did was collected a few milligrams of bone from the section of the bone, so where the bone was fractured.

次日，我们从骨头断裂的部分收集了几毫克的骨粉。

Bone meal from slaughterhouses, sugar beet waste and waste from other fermentation industries such as those that produce bioethanol are all likewise plentiful and protein rich.

来自屠宰场的骨粉、甜菜废和其他发酵工业（例如生产生物乙醇的工业）的废同样丰富且富含蛋白质。