Argon emitted blue and green light, krypton several other colours, and mixing the two gases made a laser that could emit across the visible spectrum.

氩气产生蓝色和绿色的光，氪产生其他几种颜色，两种气体的混合可以产生整个可见光谱中的颜色。

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Flooding the resulting cells with weak blue light causes them to emit directed, green laser light.

当用弱的蓝色光束照射细胞时，就可以让它们发出绿色的激光。

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When they shone pulses of light at the cell, it duly produced a "beautiful green" laser beam detectable with the naked eye.

当一束脉冲激光照在这些细胞上后，迅速产生了一条“绚丽的绿光”，此时的激光束可直接用肉眼观察。

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The team used a prototype to demonstrate the idea, hiding centimetre-scale objects illuminated with polarised green or red laser light.

BBC: Invisibility cloaking benefits from crystal-clear idea