价值不菲的金箔表面使画作颜色发亮，仿佛有光从内向外发散。

A costly gold leaf overlay makes the colors glow, as though lit from within.

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外分泌汗腺由交感神经系统控制，当身体温度升高时分泌水分至皮肤表面，蒸发散热。

Eccrine sweat glands, controlled by the sympathetic nervous system, use evaporation to cool the skin by secreting water when body temperature rises.

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使用这种技术的时候，重要的是要记住灯光的方向和它是怎样在不同表面的发散而成的。

When using this technique, it's important to remember which direction the light is coming from and how it will bounce off of different surfaces.

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