Why is it so difficult to swat a fly?
本文作者： TEENS
为什么苍蝇那么难打？You run after a fly (苍蝇) in your home. But you still can’t catch it. How do these little ones move so fast? The answer is, compared to (相比) humans, flies see the world in slow motion (慢动作), the BBC reported. |  |
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