We're talking this hour about dark flow.

在这一个小时里，我们刚刚谈论了黑暗流。

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This is called "dark adaptation" and it takes your eye up to an hour to become fully adapted to seeing in low light conditions.

这就叫做“暗光适应”。你的眼睛花上一个钟头就可以完全适应光线暗淡的环境。

youdao

At 8:30 local time, soon after this picture was taken, the district went dark in support of the world's third Earth Hour.

在当地时间的8点30分(即如下图所示)，为支持第三个地球一小时活动日，整个街区变暗了。

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At its peak intensity this weekend, the shower is expected to generate about 16 meteors per hour in a dark sky, Cooke said.

MSN: Time for your weekend shower �� of meteors, that is