chinese selfie video:teachers have eyes in the back of their head、in over my head、all ears这些习语是什么意思？

teachers have eyes in the back of their head、in over your head、all ears这些习语是什么意思？ teachers have eyes in the back of their head、in over my head、all ears这些习语是什么意思？ It is often said that ( ) teachers have ( )very easy life. I have a dream I have a question. I have a rabbit I have come to I have a question if i have time..... i have a Q!