Why is it so hard to swat a fly?

<正>Try to swat a fly and it will soon become clear that they're faster than you.Much faster.But how on Earth do these tiny creatures-with their minuscule brains-outwit us so easily?打苍蝇为什么那么难?苍蝇就好像具有未卜先知的能力,它们真的可以未卜先知吗?You've probably pondered it after chasing a fly around your house and flailing your shoe with repeated,unsuccessful swats.How does it move so fast?Can it read my mind?The answer is that,compared with you and me,flies essentially see the world in slow motion.