Then, they fill the hole in the bone with a metallic or plastic substance.

然后用金属或塑料材料来补牙。

But the new material is not a product of high technology or a metallic substance. It is wood.

这种材料不是高科技产品和金属物质，而是木材。

But the new material is not a product of high technology or a metallic substance.

但这种新材料不是高科技产品或金属物质。