If there's wood, we will use wood but the very special African woods with a very fine structure.

如果有木，我们会使用木，但会用常特洲木，结构常精细。

The sponges don't need high temperatures to generate these fine structures.

海绵不需要高温来产生这精细结构。

It is a man-made composite material that changes the conventional properties of light and electromagnetic waves by designing and reorganizing the fine structure of the material.

它是一种人造复合料，通过设计和料精细结构，改变光和电磁波传统特性。

But not just any old pure carbon, pure carbon with a very fine microscopic lattice-like structure that actually turns out to be absolutely essential to the functioning of gunpowder.

但不仅仅是任何旧纯碳，具有常精细微观晶格状结构纯碳实际上对火药功能是绝对必要。