From distance to distance, one could distinguish on the gray surface, almost invisible loopholes which resembled black threads. These loopholes were separated from each other by equal Spaces.
在那灰色的墙面上，我们可以辨别出这儿那儿有一些几乎看不出来的黑线条似的枪眼，以相等的距离相互间隔着。
The human eye can distinguish about 500 shades of gray.
人类的眼睛可以区分大约500种不同明暗程度的灰色。
The human eye can distinguish about 500 shades of gray.
人类的眼睛可以区分年夜约500 种分歧明暗水平的灰色。
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