have eyes in the back of your head

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从字面上看很简单就是脑袋后面有眼睛，虽然没有我们中文中说的“眼观六路”那么全面，但是看前看后都是没问题的了。比起只有正面的视线，更加全面了。

to know everything that is happening around you

眼观六路;目光敏锐;什么都能觉察到

Parents of young children need to have eyes in the back of their heads.

幼童的父母需要眼观六路，时时留意自己的孩子。