But the vast majority of the matter in the universe may not emit photons of any wavelength.

但是宇宙中大多数的物质也许不会发射任何光子(无论其波长为何)。

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These two photons in turn could stimulate two other atoms to emit photons, yielding four photons.

这两个光子接著会激发另两个原子放出光子而产生四个光子。

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Living systems may emit photons in response to stress and generate an ultra-weak luminescence bio-image.

生物体可以应激而发射光子生成超微弱发光图像。

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