They can also be made of plastic, animal bone or metal.

它们也可以由塑料、动物骨头或金属制成。

youdao

Bambo's the most common material, but they are also made of various types of wood, as well as plastic, porcelain, and animal bone.

竹子是最常见的材料，但它们也可以用各种各样的木材、塑料、瓷器、动物的骨头做成。

youdao

The first year, we went through 15, 000 pieces of animal bone, all of them wild.

在第一年，我们就检测出了15，000块动物的骨头，它们全都是野生的。

youdao

Other cultures throughout history have used animal bone, horns, shells, steel and even the thorns of hawthorn bushes.

FORBES: No. 19: The Fish Hook

They include 13 shards of 13th to 14th Century pottery, 70 pieces of animal bone, 22 pieces of roof tile and 68 pieces of leather, mainly shoe soles.

BBC: Reading's Friar Street artefacts analysed

It caused the French Government to ban meat and bone meal in animal feed, take T-bone steaks off menus and institute more stringent health tests for cattle.

CNN: France urges better beef labelling