Only very sharpest vision could spot this hidden killer as it lies in ambush.

就是说只有非常尖锐的眼睛才能发现这些潜伏着的杀手。

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Bat vision is generally known to be sharpest in dim light, and to get worse the brighter it gets.

而视觉上，一般来说，蝙蝠的视力在昏暗的光线下是最敏锐的；光线越亮，它们的视力就变得越差。

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