When light comes, darkness goes away.

光来了，黑暗就逃跑了。

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When light comes, darkness gose away.

光来了，黑暗就逃跑了。

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When spring's light comes, the melatonin diminishes, and suddenly we are awakened to the dusty, virus-filled house we've been hibernating in for four months.

当春天的阳光来临时，褪黑激素减少了，突然间我们被唤醒，回到了我们冬眠了四个月、布满灰尘、病毒的房子。

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"Einstein's theory of general relativity tells us that mass bends space and time, so when light comes toward us through the Universe, if it passes some dark matter, its light gets bent and the image we see gets bent and distorted, " Dr Heymans told the meeting.

BBC: Dark matter hints in widest-yet view of dark mystery

When it comes to light, the company that commissioned it is usually deeply embarrassed, and tries to disown the investigators it has employed.

BBC: I spy with my private eye.....

The laser light dims within seconds when the plastic comes into contact with even the tiniest emission of vapour.

BBC: Plastic lasers shed light on hidden explosives