在电子显微镜下，常使用一束电子光而不是普通光线来为标本照明。
In electron microscopes a beam of electrons instead of a beam of light is directed onto the specimen.
普通相机用滤光片来阻隔红外光谱范围内的任何光线。
Ordinary cameras use filters to block any light in the infrared spectrum.
自然存在的荧光蛋白质(gfp)是杂乱分布的，如同普通电灯发出的光线。
The natural fluorescence of GFP is incoherent, just like the light emitted by a normal light bulb.
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