The outer layer of skin is made up of fibers woven in a three-dimensional pattern that acts like a sponge.

皮肤表层是由纤维以三维模式交织构成，起到了海绵一样的作用。

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But da Vinci did not change his mind half way through, he said. On top of the base layers the artist added a glazed shadowing layer to create a three dimensional effect.

他称，但达芬奇没有中途改变主意，之后，他在底层上添加了一层釉料阴影层来制造三维效果。

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In conjunction with endoscopy, the technique can also view three-dimensional sections of tissue, layer by layer.

结合运用内窥镜，该技术也能逐层观察(活体)组织的三维结构。

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Behind a tinted glass panel 18-carat gold powder, laid down by a robot arm, sparkles as a laser fuses the metal into complex three-dimensional shapes, layer by layer.

BBC: How tech is transforming jewellery