A minor blemish or flaw in something otherwise perfect or excellent.
这件艺术品整体上几近完美，但一个不易察觉的小划痕，却让人联想到青蝇点玉，略有遗憾。
While this artwork is nearly perfect overall, an almost imperceptible scratch makes one think of a bluefly spotting jade, leaving a slight regret.
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