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

如果有，我们会使用，但会用非常特殊的非，结构非常精细。

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，通过重组料的精细结构，改变光电磁波的传统特性。

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.

但不仅仅是任何旧的纯碳，具有非常精细的微观晶格状结构的纯碳实际上对火药的功能是绝对必要的。