The nest he's guarding is that dark patch on the side of the rock.

它守护着的巢穴在岩石漆黑的缝隙里。

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The cause of the dark patch of water in the upper left quadrant of the image is unknown.

图片左上方四分之一处的深色块海域是未知区域。

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Soon after the upgrades, Hubble took aim at a dark patch of sky, gathering infrared light for a total of four days to detect the very faintest objects.

更新后不久，哈勃便把目标锁定太空的一处黑暗区。在连续收集了四天红外光后，哈勃发现了极其微弱的物体。

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See this little dark patch, here?

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Other papers have pictures of David Cameron leaving Downing Street and highlight what the Daily Mail calls a large patch of grey in his dark hair.

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By the shore is a small patch of lighter green surrounded by dark forest.

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